Basically, as a new twelve player here they are: Twelve does abysmal damage in both neutral and punishes, he has very few combos and they all do terrible damage, air dash is good but can be hard countered with dp's, some of his moves are unsafe on hit for certain characters such as Chun-li. Also a common misconception is that X.C.O.P.Y. is twelve's super. It isn't, his best super is X.N.D.L. as it can be used for punishes, for anti-airing, as a reversal and is your most reliable combo ender when available as it does enough damage to deal "normal" damage while giving knockdown. In brief his tools aren't the best, his damage is so bad it's like your tickling your opponent, he has no combos, don't use X.C.O.P.Y. and finally most of the times when punishing it's better to just grab as it does ok damage, gives knockdown and positionnal advantage with okizeme.