Mike :
You pretty much all know the story of this asshole, he was the victim of the bite of 87...lost his frontal lobe and acquired a nasty change in personality blah, blah, blah, and so on but Mike is aware he is the victim of that incident due to a certain purple phantom telling him...or rather showing him, Mike knows anmitronics want him dead for a crime that was committed towards the 5 missing children so long ago and whose souls now process the animal robots...an try to kill him every night as an act of revenge. Mike can be extremely stubborn at times refusing to let anything get in his way or prevent him from achieving his goal.He is not easy to befriend his nasty attitude and sarcastic remarks make many avoid him, Though once you get to know him he's actually a rather nice but very troubled guy, He has a soft spot for animals preferring them over people because they won't judge the way he looks, talks, laughs, etc.
Mika :
Mika is mikes female counterpart and the same story as mike is true for her. in the AU of the story she is pregnant with seven pups, Vincents children to be exact. she is the same person as mike yet not human ether, in chimera form Mika is heavily pregnant but very durable, her pups are much more developed due to the miracle of her chimera species, in this AU Vincent instead of being a close friend is a lover whose soul is linked to Mika's body and will defend her if need be, Mika works as a day guard at the pizzeria, she's loved by the children for her caring and mother like instincts.