I'm deep into my schizotheory that Mike is Spamton and Tenna's collective OC fanchild hallucination that took on a life of its own.
You know Noelle's blogposts about Cat Petterz and how she installed so many mods her cats started making fucked-up looking offspring that scared her so much she stopped her cats from falling in love?
Think about it, Spamton and Tenna are from 2 different worlds who weren't supposed to intermingle, they fell in love and created the concept of "Mike" together, which ended up being a horrifying monstrosity that never should've existed. Then divine intervention from the light world separated them once and for all preventing them from [Making] again.