Taro Tomita, nicknamed Bootaro, is a third-grade elementary student and classmate of the series' protagonist. His nickname stems from his distinct pig-like nose and verbal tic, frequently ending sentences with "boo," an onomatopoeic snort. This nose forms his primary animal motif.

Bootaro sports an oval-shaped head with spirals on his cheeks, enhancing his unique look. He shares a close friendship with Noritaka "Hamaji" Hamazaki, often appearing together alongside other classmates within group settings. Bootaro is also part of Maruko's wider social circle, regularly joining activities with her peers.

Within his family, Bootaro lives with his parents and a younger sister, Tomiko. He shows particular fondness and affection towards Tomiko, indicating a protective sibling bond. His favorite foods include pork buns and sea urchin.

Bootaro remains a consistent presence throughout the franchise. He appears across the long-running television series, in films like the 2015 feature interacting with international students, and in other media extensions. His role functions primarily as part of the classroom ensemble, contributing to group dynamics and comedic situations without individual storylines taking central focus. His established traits and relationships remain consistent across all seasons, movies, and spin-off productions.