Some of you already saw this on the Discord, but Bunzai* Bill is now in the game:
A few usage notes: The graphics require 16 unique 16x16 tiles, so they're split between two ExGFX files (181 in SP2, and 182 in SP4). All of the tiles couldn't fit in SP4, because of conflicts with the Shopping Carts, Math Platforms, and Bunny Rexes. However, the Diagonal Lime Platforms were overwritten. The berry sprite is overwritten in SP2, so the Bunzai can't be used in levels where Catnip can eat berries. Since a bunch of tile remapping had to be done, Bunzai needs to be inserted as custom sprite 0A (replacing the unused Ice Bro). It also uses the back half of palette E, which can be copied from one of the levels mentioned below.
Siege at Castle Wolfenstein, TRIPLE THREAT, and shopping stunts all had their Banzais replaced with the bunny. The Legend of the Captain Blackpowder still has the A2MT graphics, because Nitrogen may have intended to keep it that way with the black recolor.
*tangy's name, per this conversation: