Sega of America is responsible for Spinball. The main Sonic games of the past (and all recent ones) come from Sega of Japan or Sonic Team. They've never used characters that they didn't create themselves in Sonic games and it's doubtful that will ever change. --True Red
You say that Sega won't put Archie Sonic Comic charcters in Sega Sonic games, but most of the Freedom Fighters were copywright of Sega and some of the characters from the Comic appeared in "Sonic Spinball" for Genesis. Correct? If that's true then why can't or don't they do the same with the other Sonic games?