The character known as "Queso" is the Spanish name for "Cheese" (チーズ), a recurring figure in the *Anpanman* franchise. Queso is a small, light brown dog featuring rabbit-shaped ears and a dark brown tip on his tail. He lives in a loaf-shaped doghouse located at Uncle Jam's bakery.

Anpanman rescued Queso as a starving, crying puppy during Anpanman's very first patrol, discovering him alone in a forest. Anpanman saved Queso's life by giving him part of his own head to eat. Following the rescue, Anpanman brought the puppy to the bakery, where Batako named him "Cheese." Queso has resided there ever since, becoming a permanent resident and close companion to Butterko and the bakery staff.

Queso demonstrates high intelligence and understands human language, communicating through barks and gestures comprehensible to others. His abilities include exceptional hearing and a powerful sense of smell, which he employs to detect SOS signals or track individuals. He assists with daily bakery tasks, drives Anpanman's vehicle ("Anpanman-go"), and frequently delivers replacement heads to Anpanman during emergencies.

Playful and dramatic, Queso often provides comic relief. He shows bravery by accompanying Anpanman into perilous situations but can be lazy regarding chores. He possesses a large appetite and eats voraciously. His loyalty manifests through his consistent role as a helper and lookout.

Within the franchise lore, Queso has a girlfriend named Rare Cheese, a cheesecake-themed character. While his specific breed is unspecified, early designs resembled a basset hound. His appearance evolved from primarily walking on four legs to frequently adopting a bipedal stance in later episodes, though he retains typical canine sitting and sleeping postures. His role aligns with his established presence across the franchise as a supporting bakery resident aiding Anpanman's missions.