I'm almost positive that Azure's out. He/she already has their own Undertale RP... oddly enough.
...
anyways, in case it wasn't clear, I'm still in.
Just to let you know, Sumable is actually still busy with life and stuff, not even HE knows when he'll be back, but, maybe you should control Sans until he does. He just told me that he MIGHT be able to post on Sunday... MIGHT.