Sega Hearts All-Stars

Sega Hearts All-Stars is a Japanese-American action role-playing game developed by Sega, Disney, and Square-Enix.

Plot
When new activity with Organization XIII startles Yen Sid, he sends Sora and his gang to investigate a new world that inhabits characters from many Sega franchises. Meanwhile, a member of the Final Fantasy gang finds himself against an Organization member when the world falls to darkness. Sora and his friends meet a teenage girl and they team up to stop Organization XIII once and for all.

Sega Characters

 * Sonic the Hedgehog
 * AiAi the Monkey