My suggestions/wants for 1/4 PFs:
1) M. Bison
REG: change-o-heads; one "serious" face and one with his trademark "evil grin" face
EX: light-up purple glowing fist(s)
2) Chun-Li
EX: alpha costume (no brainer)
3) Sagat
EX: ??? Not sure, but something that isn't too desirable so that most folks can be content with just getting the regular
4) Alex
not the biggest Alex fan but I think he would make a great PF