Oh awesome. I'll check it out. But now that I think about it, Wouldn't Boo and Ghastly be VERY similar?
Down B: Transparency: King Boo turns invisible, and becomes invincible to all non-element attacks. If an element based attack (fire, ice, electric, water, energy, etc.) he turns back to normal. This effect lasts as long as the user holds the B button after the initial Down B is executed. The player can still move around in this form, however, they cannot dash, jump, dodge, or attack in any way. Also, they cannot pick up items.
this is Transparency. the other ability is "float"