Cupistol evolves into Casanuva when fused with a Love Buster. Additionally, Dazzabel evolves into Rattelle when fused with this Yo-kai.
Cupistol is a cupid-like Yo-kai that hovers around. Cupistol's body is mostly egg-shaped, and has two arms, a swirl of pink hair that appears to be grasping its halo, and a leg-like appendage with two wings on it, above its outfit. Cupistol's left hand is morphed into a pink "pistol" (it more closely resembles a revolver) that it shoots hearts from.
In the game, the Cupistol playing the piano in the school during the summer festival is shown to be annoyed by critics, and wants an audience of adoring ladies. He is saddened when you have to leave.
Anyone Cupistol shoots with his "pistol" will love you.