Blue Lock has never been just about who can score the flashiest goal. From the moment Jinpachi Ego locks these strikers into his brutal experiment, every stat, trait, and physical detail becomes part of the meta. In a series where one centimeter of reach can decide a goal-line clearance and one year of experience can mean better spatial awareness, ages, heights, and birthdays aren’t trivia—they’re part of the build.
For fans jumping between the anime, manga, and Blue Lock games, these details directly affect how characters feel to play and how they’re portrayed in canon. Whether you’re comparing Isagi’s growth curve to Rin’s raw ceiling or wondering why Barou dominates physical duels, the numbers always tell a deeper story.
Why Physical Stats Shape Playstyles
Height in Blue Lock isn’t cosmetic. Taller strikers naturally control aerial duels, shield the ball more effectively, and threaten headers the way a high-ATK unit bullies a low-defense boss. Shorter players, on the other hand, often trade reach for tighter hitboxes, faster footwork, and cleaner I-frame-style evasion in tight spaces.
These traits translate directly into how characters function in matches and in games, influencing positioning, stamina management, and how often they draw aggro from defenders. Knowing a character’s height helps explain why certain players excel as poachers, pressers, or late-game finishers.
Age, Experience, and Mental Stats
Age in Blue Lock subtly reflects a character’s mental loadout. Older players tend to have better match reading, calmer decision-making, and higher adaptability under pressure, while younger talents often rely on raw mechanics and explosive growth. It’s the difference between calculated DPS over time and risky burst plays that can either win or throw a match.
This context matters when comparing rivals, teammates, and evolutions across arcs. Watching how players mature—or fail to—hits harder when you understand where they’re starting from.
Birthdays, Personality, and Fan Connection
Birthdays might seem like flavor text, but in Blue Lock they help anchor characters in the real world. They’re often tied to personality traits, marketing events, and even in-game bonuses or limited-time celebrations. For fans, birthdays are an easy entry point into character loyalty, merch drops, and seasonal content.
More importantly, these details humanize the cast. In a series obsessed with turning players into weapons, knowing their ages and birthdays reminds you that every striker is still a teenager fighting to exist at the top of the meta.
Blue Lock Core Strikers: Ego’s Chosen Forwards (Isagi, Bachira, Rin, Nagi, Barou)
If Blue Lock had a default character select screen, these five would sit at the top row. They’re the forwards Ego Jinpachi keeps orbiting around because each one represents a different way to break football’s meta. Understanding their ages, heights, and birthdays adds crucial context to why they dominate specific phases of play and feel so different in anime arcs and game adaptations.
Yoichi Isagi
Yoichi Isagi is 17 years old, stands at 175 cm, and was born on April 1. Stat-wise, Isagi is built like a balanced starter unit rather than a min-maxed monster. His average height gives him a clean, compact hitbox that works perfectly with his spatial awareness and off-ball movement.
In gameplay terms, Isagi thrives as a scaling DPS. He doesn’t overpower defenders early, but his age and mental growth curve let him stack vision, positioning, and decision-making until he’s controlling the entire match flow. His birthday fittingly reflects his trickster-adjacent role, constantly flipping expectations once he “downloads” the field.
Meguru Bachira
Meguru Bachira is 17 years old, 176 cm tall, and born on August 8. Physically, he mirrors Isagi closely, but the playstyle couldn’t be more different. Bachira trades structure for flair, using his compact frame to slip through gaps like he’s abusing I-frames mid-dribble.
His age highlights how instinct-driven his game still is, relying on creativity over calculation. In games, Bachira often feels like a high-skill ceiling character with heavy execution demands, rewarding players who can chain movement, feints, and tight-space control without drawing too much aggro.
Rin Itoshi
Rin Itoshi is the youngest of this core group at 16 years old, towering at 186 cm, with a birthday on September 9. That combination alone explains why he feels unfair at times. Rin has the physical stats of a late-game boss with the technical polish of a veteran.
His height gives him dominance in aerials and shooting angles, while his age underscores just how absurd his ceiling is. In both anime and games, Rin functions like a precision sniper build, punishing mistakes instantly and controlling tempo with ruthless efficiency rather than flashy mechanics.
Seishiro Nagi
Seishiro Nagi is 17 years old, an imposing 190 cm tall, and born on May 6. On paper, Nagi looks like a pure power forward, but his first-touch control flips that assumption entirely. His height gives him massive reach, yet his ball handling feels glitch-level, like physics bending in his favor.
Nagi plays like a high-ATK, low-input character, converting difficult passes into instant scoring chances. His age reflects his rawness; once his motivation spikes, his growth feels exponential, making him one of the most dangerous late-bloomers in the entire roster.
Shoei Barou
Shoei Barou is 18 years old, stands at 187 cm, and was born on June 27. As the oldest striker in this core group, Barou carries himself like a raid boss who demands the ball and the spotlight. His size makes him dominant in physical duels, shielding, and straight-line power plays.
Barou’s age ties directly into his mentality, favoring control and authority over adaptability. In games, he’s the definition of a high-aggro bruiser forward, forcing defenses to collapse on him and either conceding space or getting crushed outright.
Rival Prodigies & Elite Challengers: Physical Profiles of Blue Lock’s Top Threats
Once the core strikers are established, Blue Lock escalates hard by throwing in rival prodigies and elite challengers designed to hard-counter familiar playstyles. These players aren’t just narrative obstacles; their physical profiles actively shape how they dominate space, disrupt flow, and punish predictable builds in both anime matchups and game adaptations.
Ryusei Shidou
Ryusei Shidou is 18 years old, stands at 185 cm, and was born on July 7. His build is lean but explosive, perfectly tuned for aerial finishes, acrobatic volleys, and chaos-driven positioning. Shidou feels like a pure DPS striker with zero safety checks, thriving in broken plays where hitboxes overlap and defenders lose structure.
His age reflects his volatility rather than inexperience. In games, Shidou rewards aggressive players who ignore conventional spacing, diving into traffic and converting half-chances that most characters simply can’t reach.
Tabito Karasu
Tabito Karasu is 18 years old, 183 cm tall, and born on August 15. Physically, he’s balanced rather than overwhelming, but that’s exactly why he’s dangerous. Karasu’s frame supports his specialty as a tempo controller, using body positioning and timing to disrupt opponents rather than overpower them.
In gameplay terms, he’s a debuff-focused midfielder who drains effectiveness from enemy aces. His age matches his calculated mindset, making him feel like a veteran utility pick who shuts down high-risk, high-reward strikers.
Eita Otoya
Eita Otoya is 18 years old, stands at 177 cm, and was born on December 3. He’s smaller than most top threats, but his speed and stealth-oriented movement turn that into an advantage. Otoya excels at slipping through blind spots, abusing off-ball movement like a character with built-in invisibility frames.
His physical profile makes him a nightmare for slow defenses. In games, he’s a flanker-type forward who punishes tunnel vision, constantly reappearing in scoring zones defenders thought were safe.
Kenyu Yukimiya
Kenyu Yukimiya is 18 years old, 184 cm tall, and born on April 28. His height and athletic build support his dribble-heavy, isolation-focused playstyle, especially along the wings. Yukimiya plays like a solo-lane carry, relying on mechanical skill and repeated one-on-one wins to create scoring angles.
His age aligns with his high confidence and refusal to defer. In game adaptations, he’s a high-execution character who shines when given space, but struggles if forced into constant team-dependent setups.
Oliver Aiku
Oliver Aiku stands apart as a true elite challenger, standing 190 cm tall, 19 years old, and born on June 30. As the U-20 team’s defensive anchor, his physical presence is immediately oppressive. Aiku’s height and reach make him dominant in interceptions, aerial duels, and last-second blocks.
He functions like a defensive raid boss, designed to hard-stop striker-focused comps. In games, Aiku controls lanes and denies win conditions outright, forcing attackers to reroute strategies or risk losing possessions on contact alone.
Team Z to Neo-Egoist League: Main Supporting Players’ Stats Breakdown
While headline strikers grab the spotlight, Blue Lock’s ecosystem only works because of its supporting cast. These players bridge the gap between raw ego and functional team play, and their physical stats quietly explain why they survive each selection phase. From Team Z grinders to Neo-Egoist League role specialists, these are the builds that keep compositions viable.
Jingo Raichi
Jingo Raichi is 17 years old, stands at 182 cm, and was born on September 11. His stocky frame and relentless stamina define his role as Blue Lock’s premier disruptor. Raichi isn’t about clean plays; he’s about pressure, fouls just shy of the line, and forcing errors through sheer aggression.
In game terms, he’s a stamina tank with permanent aggro draw. Raichi excels at harassing high-DPS forwards, breaking their rhythm, and enabling teammates by exhausting enemy resources rather than scoring himself.
Gin Gagamaru
Gin Gagamaru is 17 years old, an imposing 191 cm tall, and born on January 2. His height, wingspan, and flexibility make him a natural goalkeeper despite starting as a forward. Gagamaru’s physical profile is tailor-made for reaction saves and unpredictable defensive recoveries.
In gameplay adaptations, he feels like a high-DEX goalie with absurd reach. His hitbox coverage forgives positioning mistakes, making him a clutch pick when the defense collapses and raw reflexes decide the outcome.
Zantetsu Tsurugi
Zantetsu Tsurugi is 17 years old, stands 188 cm tall, and was born on February 3. His long stride and explosive acceleration compensate for his lack of technical finesse. Zantetsu is pure linear speed, thriving in straight-line sprints and breakaway scenarios.
He plays like a momentum-based speedrunner character. In games, Zantetsu dominates counterattacks and punishes bad spacing, but struggles in tight control situations where mechanical precision matters more than raw velocity.
Jyubei Aryu
Jyubei Aryu is 18 years old, towering at 195 cm, and born on November 3. His extreme height and reach make him a defensive and aerial specialist, obsessed with maintaining “elegance” in both form and positioning. Aryu controls vertical space better than almost anyone in Blue Lock.
From a gameplay perspective, he’s an aerial denial unit. Crosses, long balls, and set pieces lose value when Aryu is on the field, forcing opponents to reroute attacks through riskier ground-based options.
Aoshi Tokimitsu
Aoshi Tokimitsu is 17 years old, 185 cm tall, and born on March 25. Despite his anxious personality, his body is built like a power lifter, granting him overwhelming physical strength in duels. Tokimitsu’s fear paradoxically amplifies his performance under pressure.
In games, he’s a high-strength bruiser with inconsistent confidence scaling. When momentum is on his side, he steamrolls matchups and wins physical checks effortlessly; when tilted, his effectiveness drops despite unchanged stats.
Gurimu Igarashi
Gurimu Igarashi is 17 years old, stands at 172 cm, and was born on July 6. Lacking standout physical traits, he survives Blue Lock through opportunism, fouls, and situational awareness. Igarashi is proof that desperation itself can be a viable build.
Mechanically, he’s a gimmick character. In games, Igarashi specializes in drawing penalties, baiting animations, and exploiting rule-based mechanics, making him annoying to face and oddly effective in the right hands.
Coaches, Mentors, and Influential Figures: Ages and Heights Behind the Program
While Blue Lock is framed as a battle royale between strikers, the system only works because of the adults pulling the strings behind the scenes. These figures don’t just set rules; they define the meta, tweak the difficulty, and decide which builds are allowed to exist. Think of them as developers, raid bosses, and endgame mentors rolled into one.
Ego Jinpachi
Ego Jinpachi’s exact age and birthday have never been officially disclosed, but he stands at approximately 189 cm. His tall, lean frame and permanently relaxed posture reinforce his role as an omnipresent observer rather than a hands-on coach. Ego doesn’t need to move much; the system moves for him.
From a gameplay perspective, Ego is the game director NPC. He controls the rule set, adjusts win conditions, and forces players into high-risk scenarios designed to expose weaknesses. His physical presence is imposing, but his real power is psychological aggro control, constantly pushing players into ego-driven decision-making loops.
Anri Teieri
Anri Teieri is 22 years old, stands at 157 cm, and was born on June 27. Physically, she’s one of the smallest figures in the Blue Lock facility, but her role gives her disproportionate influence over its survival. She’s the logistical backbone that keeps Ego’s extreme ideas funded and operational.
In gaming terms, Anri is the support manager who keeps the server online. She doesn’t touch the ball, but without her resource management and negotiation skills, the entire project would get shut down. Her contrast in size versus authority reinforces Blue Lock’s theme that power isn’t always tied to physical stats.
Noel Noa
Noel Noa is 31 years old, stands around 185 cm tall, and has a confirmed birthday of April 2. As the world’s best striker and Bastard München’s ace, Noa represents the finished product Blue Lock is trying to manufacture. His physique is balanced rather than extreme, emphasizing efficiency over flash.
In gameplay language, Noa is the max-level character with optimized stats across the board. He doesn’t rely on gimmicks or RNG; every movement is deliberate, every action frame-perfect. For players like Isagi, Noa functions as a living tutorial for endgame striker fundamentals.
Hirotoshi Buratsuta
Hirotoshi Buratsuta’s age, height, and birthday remain undisclosed, but his presence looms large over the program’s political side. As a JFA executive, he represents the traditional system Blue Lock is actively rebelling against. Unlike Ego, Buratsuta values stability and optics over raw results.
Mechanically, he’s the opposing faction leader trying to patch out Blue Lock’s most broken mechanics. His clashes with Ego feel like balance update debates, where innovation collides with conservative design philosophy. Even without physical stats, his influence shapes which playstyles are allowed to survive.
The World Five and International Influences
While not permanent staff, elite players like the World Five function as external benchmarks rather than direct mentors. Their ages range from late 20s to early 30s, with tall, pro-level builds that emphasize global physical standards. Exact heights and birthdays vary, but all dwarf the Blue Lock players in experience.
In-game, they’re optional superbosses. Their role isn’t to teach directly, but to expose the gap between domestic talent and the global endgame. Every encounter recalibrates expectations, reminding Blue Lock’s strikers what the final difficulty setting actually looks like.
Age vs. Height Analysis: How Physical Stats Shape Playstyles and Positions
Once the ages, heights, and birthdays are laid out, a clear pattern starts to emerge. Blue Lock isn’t random with its character builds; physical stats directly influence how each striker generates value on the field. Just like in competitive games, these numbers define hitboxes, movement speed, stamina efficiency, and risk tolerance.
Age also matters more than it first appears. Younger players tend to rely on instinct and raw mechanics, while older teens show better cooldown management and positional discipline. When those traits intersect with height, you get wildly different playstyles competing for the same striker slot.
Shorter Builds: High Mobility, Tight Hitboxes
Characters on the shorter end of the height spectrum, like Isagi Yoichi or Bachira Meguru, thrive on movement and spatial abuse rather than physical dominance. Their lower center of gravity translates into faster direction changes and tighter dribbling lines. In gameplay terms, they have smaller hitboxes and higher effective mobility.
These players excel at off-ball movement, exploiting blind spots, and chaining quick actions before defenders can react. They’re not built to win aerial duels or shoulder checks, but they dominate neutral space. Think high APM characters that punish hesitation rather than force trades.
Taller Frames: Power, Reach, and Aerial Control
Taller strikers like Kunigami Rensuke or Barou Shoei operate with a completely different stat spread. Their height gives them longer stride length, stronger physical presence, and better contest range in crowded zones. Defenders have to respect them because their effective hitbox is larger and harder to dislodge.
In-game, these characters feel like power builds. They win physical duels, convert crosses, and force defensive aggro just by existing near the box. The trade-off is reduced agility, meaning bad positioning gets punished harder if the play breaks down.
Age as a Multiplier, Not a Stat Check
Most Blue Lock players are clustered in the same age range, but the mental gap is noticeable. Older teens like Rin Itoshi or Karasu Tabito play with cleaner decision-making and better tempo control. They waste fewer actions and understand when to disengage instead of forcing a losing play.
Age acts like experience points rather than raw stats. It doesn’t boost speed or strength, but it sharpens timing windows and reduces misplays. That’s why younger prodigies can match veterans mechanically but still lose in long-form matches.
Positioning Meta: Where Height and Age Actually Matter
When you map age and height onto positions, the design philosophy becomes obvious. Mobile, shorter players gravitate toward shadow striker and second-forward roles, where reading space matters more than body checks. Taller, physically mature players fit central striker or target-man roles that demand durability.
This mirrors team-building in Blue Lock games and spin-offs. Optimal lineups balance hitbox coverage with mobility, ensuring no single playstyle becomes exploitable. It’s less about who’s taller or older, and more about how those traits slot into the current meta.
Why Blue Lock Treats Stats as Tools, Not Limits
What makes Blue Lock compelling is that no stat distribution is treated as optimal by default. Height doesn’t guarantee dominance, and youth doesn’t excuse bad reads. Every character is forced to turn their physical data into a weapon.
From a gaming perspective, Blue Lock rewards mastery over min-maxing. The system doesn’t care what build you rolled; it only cares if you know how to use it. That design ethos is exactly why these characters translate so well into competitive anime-style sports games.
Birthday Calendar: When Blue Lock’s Main Characters Were Born
If age and height define how a player functions on the pitch, birthdays explain why their growth curves feel so different. Blue Lock quietly uses birthdates to frame maturity, mentality, and even playstyle timing, the same way RPGs gate abilities behind level thresholds. Seeing the cast laid out on a calendar makes those differences click instantly, especially for players who love optimizing team chemistry in anime sports games.
January – March: Early-Year Stabilizers
January opens with Gin Gagamaru, born January 2, a player whose instincts feel fully online from minute one. Early-year births often read as steady and grounded in Blue Lock, and Gagamaru fits that mold with his reactive, no-panic goalkeeping.
March belongs to Kunigami Rensuke, born March 11. His straightforward, power-forward mentality mirrors a player who specs hard into strength and durability early, then refines the rest later. He’s built like a bruiser class that comes online fast but needs smart positioning to stay relevant.
April – June: Core Protagonist Territory
April is headlined by Yoichi Isagi, born April 1. That early-spring placement matches his growth-focused design: not overpowered at launch, but scaling brutally with game sense and patch updates. He’s the definition of a late-game carry disguised as a balanced starter unit.
Late April brings Kenyu Yukimiya on April 28, a character whose birthday aligns with his high-risk, high-reward dribbling style. June closes with Shoei Barou on June 27, and it’s hard to imagine a more fitting slot for Blue Lock’s most dominant solo DPS. Mid-year births often signal assertive personalities, and Barou plays like the calendar bends around him.
July – September: Chaos, Creativity, and Cold Precision
July is pure volatility with Ryusei Shidou, born July 7. Double sevens suit a striker who thrives on RNG, tight hitboxes, and turning half-chances into guaranteed goals. He’s the kind of unit you slot in when you want maximum payoff and don’t care about collateral damage.
August is stacked. Meguru Bachira arrives August 8 with creative freedom baked into his DNA, while Tabito Karasu on August 15 brings calculated control and tempo manipulation. Reo Mikage closes the month on August 25, perfectly matching a versatile all-rounder who adapts to whatever build the team needs.
September 9 marks Rin Itoshi’s birthday, and the symmetry fits his hyper-efficient, no-wasted-input style. He plays like a perfectly tuned meta pick, strong in every phase and ruthless about exploiting mistakes.
October – December: Late-Year Finishers
October features Sae Itoshi on October 10, a player who feels like endgame content from the moment he appears. Late-year birthdays in Blue Lock often correlate with polished fundamentals and elite composure, and Sae operates on a different processing speed entirely.
December closes things out with Eita Otoya on December 6 and Hyoma Chigiri on December 23. Otoya’s date fits his stealth-based, off-ball assassin role, while Chigiri’s late-December birthday mirrors a player reborn after injury, all speed, all momentum, no hesitation. He’s proof that timing your comeback matters as much as raw stats.
Seen as a full calendar, Blue Lock’s birthdays aren’t just trivia. They’re another layer of design that helps explain why these characters peak when they do, and why certain lineups feel naturally synced while others clash, both in the anime and across its growing lineup of competitive games.
Quick-Reference Table: Complete Age, Height, and Birthday Comparison Chart
All Core Blue Lock Players at a Glance
After breaking the calendar down by personality, playstyle, and timing, this is where everything locks into place. Think of this chart as your character select screen: clean stats, zero fluff, and instant clarity. Whether you’re theorycrafting a dream lineup, comparing hitbox advantages, or just checking why one striker feels faster or more dominant in-game, this table gives you the raw data that underpins Blue Lock’s meta.
Ages reflect the characters during the main Blue Lock project unless otherwise noted, aligning with both manga canon and most anime-to-game adaptations.
| Character | Age | Height | Birthday |
|---|---|---|---|
| Yoichi Isagi | 17 | 175 cm | April 1 |
| Meguru Bachira | 17 | 176 cm | August 8 |
| Rensuke Kunigami | 17 | 188 cm | March 11 |
| Hyoma Chigiri | 17 | 177 cm | December 23 |
| Seishiro Nagi | 17 | 190 cm | May 6 |
| Reo Mikage | 17 | 185 cm | August 25 |
| Rin Itoshi | 16 | 186 cm | September 9 |
| Sae Itoshi | 18 | 180 cm | October 10 |
| Shouei Barou | 18 | 187 cm | June 27 |
| Ryusei Shidou | 18 | 185 cm | July 7 |
| Tabito Karasu | 18 | 183 cm | August 15 |
| Eita Otoya | 18 | 177 cm | December 6 |
Why These Numbers Matter in Play and Perception
Height and age aren’t cosmetic in Blue Lock; they directly influence how players are framed as threats. Taller builds like Nagi, Barou, and Kunigami naturally dominate aerial duels and physical matchups, which is why games often give them stronger power scaling or wider effective hitboxes in shooting scenarios.
Meanwhile, younger players like Rin and Isagi are designed around growth curves rather than raw stats. Their numbers support kits focused on awareness, positioning, and adaptability, rewarding players who master timing, prediction, and decision-making over brute force.
Seen together, this chart isn’t just trivia. It’s the stat sheet that explains why certain characters snowball faster, why others feel like late-game carries, and why Blue Lock’s roster stays balanced across anime storytelling and competitive game design.
Canon Notes & Adaptation Differences: Manga, Anime, and Game Data Explained
With the raw stats laid out, the next question is where these numbers actually come from and why they don’t always line up perfectly across formats. Blue Lock lives in three overlapping ecosystems: manga canon, anime adaptation, and licensed games, each with its own priorities. Understanding how age, height, and birthdays shift between them helps players read characters correctly, both narratively and mechanically.
Manga Canon: The Hard Lock on Official Stats
The manga is the source of truth for all character data, including ages, heights, and birthdays. These numbers are pulled from official character profiles, volume extras, and author notes, and they rarely change once established. When you see Rin listed as 16 or Nagi towering at 190 cm, that’s manga-locked data with no RNG involved.
From a design standpoint, these stats define the baseline roles characters grow into. Taller players are framed as physical threats early, while younger or smaller builds are positioned for skill expression and long-term growth arcs. Everything else branches off from this foundation.
Anime Adaptation: Faithful, but Not Frame-Perfect
The anime largely respects manga canon, but visual presentation can create perceived differences. Camera angles, animation exaggeration, and matchup framing sometimes make characters feel taller, faster, or more dominant than their listed stats suggest. Barou’s presence, for example, often feels larger-than-life even when his height is close to peers like Kunigami or Shidou.
Ages and birthdays are almost never changed outright in the anime, but they’re rarely emphasized unless relevant to the plot. For viewers, this means the numbers exist, but the adaptation prioritizes momentum and hype over stat accuracy. It’s canon-consistent, just not stat-forward.
Game Adaptations: Stats as Balance Levers
This is where things get interesting for players. In Blue Lock mobile and console adaptations, canon height and age influence kits, but they don’t hard-lock performance. Developers use these stats as tuning levers, adjusting speed, shot power, stamina, and even hitbox behavior to maintain balance.
A taller character might get better aerial reach but slower turn speed, while a younger player like Isagi or Rin often gets stronger vision-based abilities, cooldown reduction, or positioning bonuses. The games respect canon identity, but gameplay balance always takes priority over realism.
Why Small Differences Matter to Players
When a game slightly tweaks a character’s physical presence or performance, it can change how they’re perceived in team comps. A Nagi who feels heavier in-game reinforces his manga identity as a high-ceiling striker, even if his raw speed is toned down. Meanwhile, a slightly faster Chigiri in-game sells his speedster fantasy, even if the anime frames him more cautiously post-injury.
For players who jump between anime episodes and ranked matches, these differences aren’t contradictions. They’re adaptations designed to keep the roster readable, competitive, and fun.
How to Read Blue Lock Stats Across Media
The key is knowing which version you’re engaging with. Manga stats explain who a character is supposed to be, anime presentation shows how they feel in motion, and games translate both into systems you can exploit. If you treat age, height, and birthdays as lore anchors rather than hard rules, everything clicks.
Final tip: when building teams or picking mains in Blue Lock games, use canon stats to understand intent, but trust the in-game numbers for performance. Blue Lock has always been about evolution, and that applies just as much to its data as it does to its strikers.