I'd love to do some Tamora Pierce characters - it would be awesome to do Alanna of Trebond from the Song of the Lioness quartet. It would be awesome to do the costume from the US 2010 cover of LIONESS RAMPANT - it's very simple, gold chainmail over gray leggings and plain boots. Plus, she's short, so I wouldn't be too off - except that she has red hair and purple eyes...
It would also be fun to cosplay June from LEGEND and PRODIGY by Marie Lu. She's so cool. At the same time, her outfits aren't really described that well... It might be difficult, since the only thing that's easy to figure out is that she has long black hair in a ponytail.
Shana - School Uniform (Anime/Manga)
Avatar Korra (Comics/Cartoons)
The Girl (Original Design)