We have a theory on why most of our system is nonhuman. Of course, it's just a theory, but it makes sense to us.
We're autistic, right? So we were already different from the start- but we didn't know how or why. Making friends was hard, keeping them seemed even harder. So you have a kid who's alone, different, and reads fantasy books on the playground during recess.
Our theory is, somewhere in the back of our mind, we took those fantasy books and went, "These people are strong. These people can overcome things. These people are out of place, like me."
I remember we were somewhat strangely obsessed with wings, even in fourth grade. Strangely obsessed with fantasy, too- worlds, creatures, monsters. We felt more at home in fantasy than in real life. We'd say, out loud, "I want to go home", and the adults would reply "you are home". Logically, we knew we should agree. But something in us couldn't.
MaDD kicks in, replacing those books with stories in our head, but the fantasy never leaves. The wings never leave. The power never leaves. The way we watched someone, in our mind, who's like us, overcome anything and everything they needed to. Someone different, like us. Someone not human. Like us.
We never truly noticed, until we truly noticed "I" had turned to "we". Looking back, it was...always there. Since early elementary, we were there. I was there.
We always loved the trope of "nonhuman character has to blend into a human environment". Apparently, that's because we relate to it. We relate to being lost in a world that's not your own, even before we realized that was the case.
We aren't human. Maybe once, a long time ago, we started human. Just maybe.
But this world has turned us into monsters, and we like it that way.