Complete Costumes

Kim Possible (Combat)
Kim Possible, Disney
Poison Ivy (Leafy version? More leafy than latex, if that makes sense. :P)
Batman, DC comics
Leafeon (Gijinka)
Pokémon
Integra Wingates Fairbrook Hellsing (olive-green suit)
Hellsing

In Progress Costumes

Nemu Kurotsuchi (Shinigami ropes)
Bleach
Seras Victoria (light-blue Hellsing uniform)
Hellsing

Planned Costumes

Motoko Kusanagi (skimpy uniform, with trousers though. ;p)
Ghost in the Shell
Faye Valentine (haven't decided)
Cowboy Bebop