As I mentioned in the sketch from some days ago, Gankuu (At least, this specific version of him) is of the same race Abigail and Sanoske are. Unlike those two, however, he was not captured and had his wings removed, as he managed to escape to another planet before that happened.

That said, he wasn't able to avoid getting captured by another set of aliens that placed a particular parasitic creature inside him, causing Gankuu to share his body with a being he would later refer to as Casanova (or "Cass").

I won't go into their story too deeply at the moment, though. Still working out some stuff.