Hmm i could suggest you Soul Eater , Chrome Shelled regios or Pandora Hearts they have kinda wicked fighting scenes Chrome Shelled Regios has protagonist who has deep past ... Soul Eater is more to wicked fighting ... and Pandora Hearts has children protagonists ... other than that i don't really have much to offer iam more addicted to drama romance animes and comedy oh yeah i will later on post something about new Fighting Anime called Needless ... but its more like comedy fighting ecchi anime ...
but really wicked fights ;/ sorry couldn't be much of help.
and edit: sorry but its hard to find such art style besides FMA ... iam myself looking for such art style animes ... but most just doesn't have what it takes to get you into watching ...