I'll say black, but...

Keisha's is black.

Jasper's is a very dark liver, almost black. If you look closely in the right spot, you can still just barely see where his last butterfly spot has not quite filled in yet.

And Cadet's is nostly black (started out mostly pink), but right at the tip of each nostril she has a thin pink line (it looks like she double-pierced her nose). She has just hit one, and the butterfly spots are still bright puppy pink... so she may very well be a butterfly nose, but it isn't 100% set in stone it won't decide to go all black still . We'll see.