A popular crossover build often discussed in community videos that includes Kamen Rider characters alongside other anime heroes. Kamen Rider vs Ultraman MUGEN
Since these are fan-made projects, you won't find them on official storefronts. You can find active download links and setup tutorials on: kamen rider mugen download android
An updated full-game build featuring over 18 playable characters like Kuuga, Agito, Decade, and Gaim. Jump Force Movement v10 A popular crossover build often discussed in community