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.
Too deep in yearning we need
something to hold, and something to keep
Innocent eyes could not realize
the meaning of "destiny"
But someday I promise that
you’ll start to notice what’s there on your shoulders someday -
Wings that are strong,
they will guide you along to the future that holds your fate!
Let me tell you a cruel angel’s thesis -
Flying high from the window, finding egress
There is something betraying all my memories,
burning pathos, emotion overwhelming!