User blog comment:GaoMikadoFan 4/Questions on Buddyfight/@comment-4844839-20140623154902/@comment-4844839-20140627055006

@Blaz and @Tyrant: Ancient World can be midrange (if you put in more size 2 and 1 monsters), but generally is a control type.

Katana World is rather unique; their monsters are of midrange type (they have a lot of small sizes), while their playstyle is more of a control type (particularly true for Ninja decks). Perhaps it's safe to say that in general, Ninja = control and Skull Warrior = midrange.