Possibilities for crossover characters include AiAi from Super Monkey Ball, Kazuma Kiryu from Yakuza, and potentially even Mario from Nintendo. The first gameplay trailer of Sonic Racing: ...

However, Trip's inclusion in IDW's series actually ... if it weren't for a creative decision made by the Sonic Superstars team and Sega's creative influence over IDW's own continuity.

Since the character’s debut in 1991, Sega has done a lot with Sonic the Hedgehog ... t yet introduced characters like Shadow, Rouge, or Trip, so there’s a lot of opportunity to build on ...