There is currently no real answer to this as odds are a Smash Bros 4 isn't even in the works, if there was one though it would likely contain more Sonic characters as each game has been packed with considerably more content as it has gone along. Might see some tough characters like Knuckles and Shadow, probably wouldn't have much more than that.
Just sonic.
is a nice flash game who look like super smash bros but is only with sonic characters e.g. super sonic super shadow silver blaze tikal
no no no why is because sonic is not in super smash bros. or super smash bros melee he's in super smash bros brawl but not in the other games
Sonic Underground is an animated TV series. And no, you cannot unlock episodes, or characters other than Sonic, from Sonic Underground in Super Smash Bros Brawl.
No, in fact Shadow isn't even in Super Smash Bros. Brawl. He is from the Sonic games. Sonic however, isn't from Super Smash Bros. Brawl but Sonic is in Super Smash Bros. Brawl.
Snake and Sonic are new characters.
Super Sonic
No but you can be sonic on super smash bros brawl
About 25 characters Sonic is not really on there. That's all.
Falco fox pikachu sonic
Dark super Sonic is not a character in Super Smash Bros Brawl.
Get Super Smash Bros. Brawl