User blog comment:ChrysieeBoo Lovely/Topical Question of the Month: Ninja-Wizards on the Wiki?/@comment-4945309-20140328033119/@comment-4945309-20140328152210

Kelpies, Kappas, and Grindylows are the only three known for sure types of demons, and if we were to classify the Oni as one, I don't think that it would suit the Harry Potter type demons for them to have a leader as said in the latter portion of the blog.