The minis native to the world of My Little Pony: Friendship Is Magic are mini-Discords, smaller versions of the continuum's native spirit of chaos and disharmony. Unlike most minis, they retain a portion of their power, and their desire for mischief can make them troublesome in large numbers, so putting more than a handful of them in any place other than the Royal Fanfiction Academy of Equestria can be a Very Bad Idea.