On the bright side for those that want Shadow, that might mean Shadow's being saved as a DLC candidate (Sonic fans would just have to deal with Sonic being alone again for a while despite Castlevania getting two until DLC starts). Maybe as a Sonic series character package with him and Tails together. Or Tails could even be Sonic's echo fighter in the base game and Shadow will be DLC (Which may annoy me a bit because that would mean Shadow is made more unique then Tails would be. But I'd be happy with any way Tails gets in now)
I've been thinking about this as a possibility. Wouldn't mind this in the slightest if it means Tails in and a possible unique Shadow.
Tails was pretty similar to Sonic in Fighters all things considered so it's not completely OOC. Outside of some combos and Tail moves, he shared these moves with Sonic:
He had Spin Attack, a Windup Punch (it's similar but works as an uppercut), Spin Drive, Scissor Punch, Rocket Missle and some moves that are also shared with some other fighters.
They would probably look to Fighters too since most of Sonic's moveset derives from that game.
His forward tilt is his Horse kick:
Forward Smash is the Windup Punch:
His Fair is from Emerald Drive:
Up Air scissor kick is just Scissor Punch but with his feet: