Buster Baxter (voiced by Daniel Brochu, under-credited as Conway Bruce) is Arthur's best friend. He is a white rabbit boy who wears a turquoise long-sleeve shirt and dark jeans. He has asthma, is obsessed with aliens, is interested in comedy, is an amateur detective, and plays the tuba. He loves eating, practices gardening, and keeps expired food in his room and school desk. He is an only child whose parents divorced when he was younger.[2] He created and celebrates a no-frills holiday called "Baxter Day" with his mother. His father travels the world due to his work as a pilot, and as a result they were given a spin-off series, Postcards from Buster. Buster is also a procrastinator, often preferring to have fun rather than study; one such instance nearly led to him flunking third grade before cramming at the last minute. He's based on Mark Brown's best friend when he was that age.