I claim Nymph from Sora no Otoshimono as my waifu.
A girl who really has been through some terrible stuff. Suffered under a horrible master and as much as anyone I've seen in anime deserves some happiness. An angeloid with strong feelings and an appreciation for candy apples. Really she's just been through so much and that really drew me to her. Does have a nice tsundere character, but can appreciate having an emotional guard after all she's gone through. Of course has incredibly cute wings and is a cute character in general. Definitely a favorite.