Originally Posted by MechDeus
In terms of special moves:
Elena -> Cammy; Cannon Spike and Thrust Kick are obvious, with Elena's spinning kick replacing the knuckle
Hugo -> Zangief; Obvious
Remy -> Guile; Obvious
Necro -> Dhalsim/Blanka; Stretching and air drills from Dhalsim along with electricity and rolling (spinning forward) from Blanka
Urien -> M. Bison; Flying Knee Drop's multiple angles cover Head Stomp and Flying Psycho Fist, Chariot Tackle for Psycho Crusher, Dangerous Headbutt for Scissors Kick
Sean -> Dan; Obvious
Q -> E.Honda; Slashing attack for Hundred Hand Slap, Dashing for Sumo Head Butt (And that's pretty much all both of them need :p)
And probably a few others I can't think of right now.None of them play in such a way that you can use the exact techniques and setups from prior SFs, but that almost always happens in sequels as things get tuned and changed around.