This shouldn't surprise you, but my favorite character to cosplay is Nozomi! She has tons of outfits to try; her outfits suit me; and I love her character! It's fun to be here because I feel so connected to the character, and my friends also cosplay from the series so it makes it really fun to be part of the crew.
The picture I put above is the favorite outfit of mine that I've cosplayed from Nozomi so far!!
Another character I love cosplaying is Homura from Madoka Magica. I find her story to be tragic, and the way she handles despair is similar to my own, I think -- trying to fix everything for my own sake, lol. This is a really old pic of me cosplaying her, as it's been a while since I've cosplayed it :P