Ruka is technically [not human because he's an intelligent computer simulation given a physical body?!?! MAYBE HE KINDA LOOKS MADE OUT OF DATA despite being 100% organic.]

Senri is a +Anima so he has the spirit of a bear attached to him. He has already regained but not yet taken a skill that will attach the lingering presence of ANOTHER bear to him, this one being a man-eating ragemonster. IDK WHAT THAT WOULD LOOK LIKE BUT THERE'S THE DEETS.