As long as Sonic is ostensibly a multi-platform character I don't want them to add anymore characters from his franchise but him as anything other than trophies and assists. If they want to add another Sega rep that's fine (and they have, although Bayo's pretty much a Nintendo character at this point), and there are plenty of avenues to take but I cannot in good conscience start wishlisting for Sonic characters to fill up roster spots.
No, not even him.
Good day from the house of the haunted
Get a job, get a house, get a coffin
Don't stray from the path, remain where you at
That maximizes our profit
Is that blunt? Oh well, hell, so's this boot
We live to hear you say "please don't shoot"
A pure delight, c'mon, make my night
When I file reports what's right's what I write