Cat Banzai Bill
From the Super Mario Wiki
Like normal Banzai Bills, Cat Banzai Bills are fired from Banzai Bill Cannons. However, unlike normal Banzai Bills, they will lock onto and follow the player, being very similar to red 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, making them resemble a tuxedo cat. They will sometimes drop a Super Bell when defeated. They make their only appearance in The Bullet Bill Express.
Cat Banzai Bills reappear in Super Mario Maker 2, where they are enemies that can be placed in the Super Mario 3D World style.
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