Second character

[Boomer_007]

Who could it be?

[SUPASONICBOOM]

Dr Eggman (Dr Robotnik)
who else could it be?

[Dr. Sega]

I was under the impression that "Featured" meant playable, so I was thinking Tails or Knuckles. I also thought that the countdown below "Featured" is for another slot of characters that aren't playable, like maybe "Enemies". I dunno. I guess it's just wishful thinking that either Tails or Knuckles could still be playable.

[Myeou]

Dr Eggman (Dr Robotnik)
who else could it be?

yes , he could be
but other it can be tails to

[Nesplayer]

I'm thinking that it's tails.

[Boomer_007]

may be completely new character?

[FireKingX]

Big the Cat

[Gamerscredo-M]

umm...Tails..?!?

[Solaris Paradox]

Considering the point in the timeline (immediately after S3&K), it's either completely new character (unlikely, considering what this game is) or it's Tails and/or Knuckles.

Well, I suppose it could be Amy, too, but I doubt it.

[shellcracker]

I'm thinking it's Eggman but I would quite like to see Tails.