64: Captain Falcon, Mario, Link
Melee: Captain Falcon, Marth, Dr. Mario, Link
Brawl: Wario, Marth
PM: Captain Falcon, Wario, Marth, Link
3DS/Wii U so far: Mega Man, Marth, Link
I have no doubts that Captain Falcon will be confirmed for Smash 4 but Wario had better be there too dammit