Bupkus, known originally as Bull or Buru in Japanese media, is a bulldog character. He antagonizes the main group of cats and dogs led by Tama, frequently bullying them. His owner is Kaneko Kuramochi. Bupkus harbors a persistent, unrequited crush on Momo, a sweet-natured cat within Tama's circle; Momo remains unaware of his feelings, shaping their interactions. His personality contrasts with more domesticated pets, leaning toward intimidation and troublemaking directed at Tama and friends. His role, background, and relationships remain consistent across various seasons, movies, OVAs, or spin-offs. His background consistently identifies him as a pet with a defined owner, distinct from stray characters like Nora/Rockney.