Couple of good suggestions there. I think I heard the Loki is sort of like that as well. (I didn't get past the first episode, so I can't say for certain.) D.N. Angel definitely, though. I don't remember if you've seen it or not, but if you haven't, you owe it to yourself to go get it now and watch it. ^_^
I've seen about 5-6 episodes of Loki, and all of D.N.Angel (plus I'm collecting english manga volumes). They were the only two that came to mind for me, but I don't know if two series qualifies as a genre. I've never heard anyone speak of a series as a 'magical boy' series, but there are 'magical girl' series everywhere.
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