Blay'n is a nice and sympathetic elf who tries to help Phineas and Ferb show Santa that Danville is nice. He is different from his friend Clewn't in many ways. He seems to be young because Clewn't has a mustache and white hair while Blay'n has brown hair. He is shown to be extremely short when he and Clewn't first meet Phineas, Ferb, Baljeet, Candace, Isabella, and Buford. Blay'n and Clewn't both create presents for Phineas and the gang to distribute, through Blay'n seems to be more inexperienced than Clewn't. He creates a basketball net, a baseball mitt and a vase, but Clewn't destroys the vase with a bowling ball.
- "Phineas and Ferb Christmas Vacation!" (First appearance)
- "Rollercoaster: The Musical!" (Cameo)
- "Let's Bounce" (Speaking cameo)