A transformation of King Boo using the Super Crown, similar to Bowsette.
In King Boo's case, he turns into a variant of Princess Peach that typically has a white dress, white hair, pale skin, and red or purple eyes. She frequently is shown to have sharp teeth and have her tongue out, much like how King Boo does normally.
The initial version appears to be this picture by oshiruko_(tsume).
Do not confuse with a Super Crown version of regular Boos; that falls under Peachyboo instead.
The following tags are aliased to this tag: booette, boosette, and queen_boo (learn more).