User blog comment:IceLoverMei/Donkey Kong vs Bowser/@comment-11361577-20161002100522/@comment-5078776-20161002125456

It seems that Ice is using an amalgation version of each warrior, which isn't illegal in terms of policy. As far as I'm concerned, this is fine.

As for the whole SSBB thing too, we've had warriors from the same fighting game fight before. Hell, Wass even had a whole tournament about Smash Bros. specifically fight it out.