my strategy in marvel was to be as safe as possible and not get mixed up too much (i hate crossups and stuff like that. my defense is pretty good, but i still hate em)
so i love invincible assists. since tron is gone, and i think haggar is boring, i use hsien ko. some day i might change to iron fist first, but when i started mvc3 i tried hsien ko first just so i can use the first meter to go gold, and i wanna try and see if it's viable again this time around. i'll be using hidden missiles or iron fist's GODLIKE DRAGON KICK ASSIST to make sure of that.
i still like going in balls deep so after i get hsien ko assist, i wanna use cool, dirty rushdown characters and i think iron fist is the one for me. switching from vanilla x-23 will be cool, since they have comparable wavedashes. aka amazing ones.