Sonic is the main character of Sonic For Hire series and appears in Mega Man Dies At The End: On The Lam and was refered by Dr. Wily as a "Blue Hamster"

He also makes an appearence in the Series Finale of Mega Man Dies at the End with Dr. Eggman. Before the Teenage Mutant Ninja Turtles attempted to kill Mega Man for flooding their home, Sonic shot them down with a gun out of nowhere. After Mega Man defeated X and Zero, Mega Man talked about how awesome it would be if he and Sonic teamed up, only to have Sonic push him into a floor of spikes, killing him.