None, really. Online lag allows Raiden's Forward Circle (?) to loop into his forward grab, but other than that, there are only loops.
If you mean loops, then Dante's Empty Cancel, Dante's Parry Cancel, Drake's Run and Cover, Toro has a few, I think, Cole has a semi-loop of sorts. These are the only ones I can think of at the moment.
Fresh to death
Also Nariko has something like Raiden's; a pseudo-infinite that only works in lag, but it is stage specific so meh.