Yog-Sothoth is one of the "elder gods" in the cthulhu mythos, supposedly "the gate and the key", a living portal creature that simultaneously exists at every point of space and time yet remains locked outside normal reality. Has a thing with gaps. So I've taken to jokingly calling Yukari "Yog-Sothoth" for her ambiguous background, nature and habit of opening gaps to eye-filled nightmare realms for transportation.
Also, looking at that butt, you suddenly and acutely realize the appeal of crazy elder god cults. They put out.