Um, kinda pathetic the first thing that came to mind was:
Kurosawa Kakeru or Kitahara Aya from "Onani Master Kurosawa"
.... but, anyways, off the top of my head.
Yako Katsuragi from "Majin Tantei Nougami Neuro"
http://nogamineuro.wikia.com/wiki/Yako_Katsuragi
You could also do Beyond Birthday or Near from Death Note, depending on what you have in your closet.
Lucy Heartfilia from "Fairy Tail"
http://fairytail.wikia.com/wiki/Lucy_Heartfilia
Gray Fullbuster from 'Fairy Tail"
http://fairytail.wikia.com/wiki/Gray_Fullbuster
Kagome Higurashi from "Inuyasha"
http://inuyasha.wikia.com/wiki/Kagome_Higurashi
Sai from "Majin Tantei Nougami Neuro"
http://nogamineuro.wikia.com/wiki/X
Ed from "Cowboy Bebop"
http://cowboybebop.wikia.com/wiki/Edward
Spike from "Cowboy Bebop"
http://cowboybebop.wikia.com/wiki/Spike_Spiegel
Most of them depend on your closet and what you can get in a short period of time. But those are the ones I could think of that were relatively simple to put together.
EDIT: I second a Homestuck human character.