The best video game crossovers do more than put a familiar character on a screen: they make the meeting of different worlds feel meaningful in play. There is no verified industry ranking, so this guide compares crossovers by four editorial criteria: how deeply the guest franchise is integrated into gameplay, the significance and contrast of the franchises involved, the amount of meaningful content added, and whether the collaboration extends into other ways to play.
What counts as a video game crossover?
“Crossover” can describe several different designs. A guest character may join an established game; a game’s central premise may bring multiple fictional worlds together; or a collaboration may extend from digital play into physical products. Those forms are not interchangeable, so the examples below are considered in context rather than forced into a single objective ranking.
- Guest-character crossover: a character from another series enters an existing game, often as downloadable content.
- Franchise-level crossover: the meeting of different properties is built into the game series itself.
- Cross-format collaboration: related experiences or products bring the collaboration beyond the original game.
Super Smash Bros. Ultimate and Kingdom Hearts: a landmark guest fighter
Nintendo announced Sora, the protagonist associated with Kingdom Hearts, as the final downloadable-content fighter for Super Smash Bros. Ultimate. It is a clear example of a guest character joining an established crossover fighting game. Sora’s addition is DLC, not part of the game’s original base roster; Nintendo’s announcement identifies him as the game’s final DLC fighter: Nintendo’s announcement.
The appeal is the contrast between franchises: Sora brings the identity of Kingdom Hearts into a game built around characters from multiple series. Under the criteria above, this is a particularly notable guest-character crossover, though its documented form is a fighter addition rather than a separate Kingdom Hearts campaign within Smash.
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Kingdom Hearts: a crossover at the heart of the series
Kingdom Hearts is not simply an outside character appearing in another game. Square Enix describes the saga as a collaboration between Disney and Square Enix, making the meeting of those properties foundational to the franchise itself. That makes it a useful example of crossover design operating at a broader level than a one-off guest appearance. See the Square Enix Kingdom Hearts collection page.
It also explains why Kingdom Hearts can appear in more than one kind of crossover conversation: the series is itself built around collaboration, and its character Sora has also appeared as downloadable content in Super Smash Bros. Ultimate.
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Fortnite and Kingdom Hearts: a time-sensitive in-game collaboration
Epic’s September 2026 announcement documents a Fortnite collaboration with Kingdom Hearts, including character cosmetics and LEGO Fortnite styles. It is a contemporary example of a collaboration adding recognizable franchise content to an existing game. Epic describes the collaboration in its official Fortnite announcement.
Cosmetic availability can change, so the announcement should not be read as a guarantee that every item is permanently available or accessible in every region or mode. Unlike Sora’s Smash DLC role, this collaboration is presented through cosmetics and styles rather than a new playable fighter.
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LEGO Fortnite: when the crossover reaches physical play
LEGO Fortnite illustrates how a game collaboration can extend beyond software. LEGO describes the partnership as a digital play experience and identifies physical sets featuring characters, creatures, and in-game icons. The company says the sets turn “favorite characters, creatures, and in-game icons into builds made for play, display.” Details are on LEGO’s What is LEGO Fortnite? page.
This gives LEGO Fortnite a different strength from a guest fighter or a cosmetic collaboration: it connects digital play with building and display. The official page supports the existence of physical LEGO Fortnite sets; it does not establish their current stock or availability at any particular retailer.
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Epic and Disney: an announced direction, not a list of launched experiences
In February 2024, Epic announced that Disney and Epic Games would create an expansive games and entertainment universe connected to Fortnite. This is evidence of a planned partnership and direction, not proof that every proposed experience has already launched. Epic’s announcement is available here.
That distinction matters when judging crossovers: a released fighter, an announced in-game collaboration, a product line, and a future-facing corporate partnership represent different levels of availability and integration. Treating them as equivalent would overstate what players can access now.
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Which video game crossover is the best?
There is no verified survey or comparable publisher-issued statistic establishing a single winner. The answer depends on what kind of crossover you value most:
| If you value… | A strong example | Why it fits |
|---|---|---|
| A guest character in an established game | Super Smash Bros. Ultimate and Sora | Nintendo documented Sora as the game’s final DLC fighter. |
| A collaboration built into a franchise premise | Kingdom Hearts | Square Enix describes the saga as a Disney and Square Enix collaboration. |
| In-game collaboration content | Fortnite and Kingdom Hearts | Epic’s 2026 announcement documents character cosmetics and LEGO Fortnite styles. |
| A crossover extending into physical products | LEGO Fortnite | LEGO identifies physical sets alongside the digital play experience. |
If “best” means the most direct guest-character moment, Sora’s addition to Super Smash Bros. Ultimate is the clearest fit among these examples. If it means a crossover that defines a whole series, Kingdom Hearts is the better match; for play beyond the screen, LEGO Fortnite stands apart. These are criteria-based judgments, not a claim of universal player consensus.
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