This is Demon Wolf Fairy, a.k.a Freya! Although she looks a bit deranged, she is not evil. Well, not very evil. See, she loves her forest, and all it's animals, and would do absolutely anything to protect it from destruction(e.g. humans). Unfortunately, she also bears this whole deep hatred and resentment thing towards humanity. When people come to cut down and dig up the forest, she flies by with her guardian wolf, Thor, and blows up all their machines and stuff(along with unfortunate human workers). She hates having to take life, but she believes in the greater good. The whole 'the end justifies the means' philosophy. So is Demon Wolf Fairy evil? I guess that is up to you.