I came up with this guy, Jester Sans. He was created by Error Sans when one day he got curious about making an AU, so he took Ink's brush and tried to make an AU but it only resulted in a splat of ink on the wall. He thought he'd failed but then from the ink splat emerged Jester, who since he was created incorrectly by Error, didn't fully develop from the ink nor does he have a universe. I'm also working on an idea for a universe I call Understill, though a lot of it needs to be refined