Boris is the equivalent of the Cheshire Cat's character in terms of personality traits. He enjoys posing riddles, just like the fictional cat he was modeled after. Boris has functional feline ears and a tail, as well as several piercings and tattoos. His attire consists of short outfits that reveal his pink boa and chain collar. Boris works in the Amusement Park District under Mary Gowland's supervision. Despite being cunning and mischievous, he develops a close bond with Alice. Although he is friends with Dee and Dum despite their affiliation with opposing groups, he also attends tea parties at Hatter Mansion with Elliot and Blood. On multiple occasions, Boris has sneaked into the Castle of Hearts. Unfortunately, his reckless behavior caught up to him when Alice discovered him injured and bleeding. After receiving a reprimand from Alice, Boris pledged to change his carefree ways for her sake.