I hate to be the one that brings it up, but if they are going to follow closely to the original concepts of Holos we won't see Haachama at all, since it's her own creation, and Haato would be just a highschool student, probably friends with Matsuri.
Of course I hope I'm wrong and we will get kino Chammers villain, preferably with a plot twist, where Haato used to be good but got corrupted and betrayed the rest
