User blog comment:Jkphantom9/Some Ruby figure fun, I presume?/@comment-24631732-20140313191157/@comment-4010415-20140313210448

That's not something taken from other animes. It's more like a trope. There are a lot of animes that feature people being trained to fight and kill monsters. That doesn't mean they're copying each other.

Hell, I can stretch and twist things around to say that Bleach and Soul Eater are exactly alike and that one copied the other.