With Chun on Zangief (and perhaps on others but Zangief seems easiest to do it to) you can do upkicks, j.hp, repeat. There’s two weird things regarding this: 1, it seems you actually have a decent number of jumping frames before you have to cancel the jump into the upkicks, so if you time it well you can get quite a few reps in before you get pushed out. 2, sometimes when you land you get pushed back an insane amount (like, you just go sliding across the whole screen), but it seems you can cancel this by jumping fast enough after you land.
I think you might be able to make this combo into an infinite if when you’re nearly too far out you do an air SBK rather than a j.HP, but I haven’t managed to do it myself. Still does a shitload of damage anyway.
Also found a bug with Chun (actually might work with anyone with an airthrow), again on Zangief, but I haven’t tried it on anyone else. In the corner (I tried it in the P2 one I think), you can do s.lk, jump and airthrow him. It’s a small window, but the timing isn’t that hard. Then, while he’s on the floor, you can position yourself so that your hitboxes overlap when he gets up, so when you tap left and right repeatedly, you keep switching sides. Don’t know if there’s any combos you can do from this, but it’s a pretty fun glitch.