The Cat Banzai Bill is an enemy in Super Mario 3D World. It is a Banzai Bill that has used the Super Bell, making it appear more cat-like. They act just like the Cat Bullet Bills and only appear in The Bullet Bill Express.
Like normal Banzai Bills, Cat Banzai Bills are fired from Banzai Bill Blasters. However, unlike normal Banzai Bills, they will lock onto and follow the player, being very similar to homing Banzai Bills in this sense. Also, unlike normal Banzai Bills, Cat Banzai Bills are colored white on their lower half, instead of being completely black. They will sometimes drop a Super Bell when defeated.