King in 98,99 and 2000, can do two of the qcb kick super, only if the opponent attacks you and the word counter comes out on your side, it isn't actually two complete dm's though, she will hit the opponent with first hit then since she got hit, she will stop but the opponent will be stunned, if you are in the corner, you can do the qcf qcb super,
Obviously eveyone seems to know the Chang one in 98 and 2000{ I don't know about 99}, where you do the qcb qcf p super, and if the super ends with the b button looking kick you can do the qcfx2 with A super.
The Terry one is cool, as long as the word counter comes out, you can do the qcfx2 b super twice if you want to, but here's a cooler one, let the opponent block everything and on your way down, if he tries to hit you and gets hit by the generic geyser then the word counter comes out your side, then you can do the power geyser, as he is still in the air after being hit by the generic geyser.
In 2000, Robert can do two of the qcf b supers if the opponent falls straight down from the super, it usually only happens if the opponent jumps at the wrong time, or gets hit by a striker{which is irrelevant to this topic}
Kyo can also do two supers, again with the counter thing,same with seth{which is similar to king as he too will stun the opponent long enough to same super again} who can forget the kicking super where he blasts the guy up so you can do the qcfx2 super. Yuri too, with her shin shoryuken looking super, if the word counter comes out.
Even Ryo can do it, really rare though, throw the slow big fireball and again if the word counter comes out throw the big fireball{the condition is that hopefully he is coming down from a jump so he will be kept in the air a split second longer}, the problem is the opponent must be in the corner and you must be kind of close to him, if you are next to him, the fireball will go past him,if you are too far, the opponent will fall land before the fireball reaches him. Maybe one can do the qcfx2 p super, I don't know though.
This is getting way too long, I apologize guys, I don't want to seem like a guy who can talk the talk without explain how I walk the walk, forgive me guys.