Hrm... heh.. Sailor Saturn... Vampire Princess Miyu... Lulu (just put your hair up, its a complicated outfit though prolly)...
Hrm, harder than I thought.. I figured I'd be able to name more off the top of my head. Bleh.. dont have all day, maybe I'll post more later if any come to mind.
Ren

Melfina (outlaw stars) nedd to poof up hair
Athena Asamiya (King of fighters) need red costume
Yuri kusanagi (king of fighters) brade hair
Whip (King of fighters) *get whip from katyjag*
Tifa (Final Fantasy) really simple
Yuffie (Final Fantasy) extra item might be hard
Aki Ross (Fianl Fantasy movie) the movie sucked!
Jam (Guilty gear) outfit very skimpy
Nakoruru (Samurai Spirits) red ribbon
kaoru Kamiya (Ruroni Kenshin) tie hair with ribbon
Xiengha (Soul Calibur) need head band
Taki (Soul Calibur) ti hair
Faye valintine (Cowboy Bebop) skimpy hot
Peorth (Ah my goddes) super ultra skimpy!
Rally Vincent (gunsmith Cats) easy
ya ya some of these characters dont exactly have black hair but very close ones. C'mon purple hair? it doesnt really show up even if you do die it.
I personally dont cosplay often at expos but cosplay or dress up at renissance fairs.
heres a picture
www.geocities.com/afterma...s/ren4.jpg
made the outfit all by me self