Noritaka Hamazaki, commonly called Hamaji, is a male third-grade student and a classmate of the title character in Chibi Maruko‑chan. He is known as the class clown, regularly making his peers laugh with jokes that resemble stand‑up comedy and with humorous impersonations. His energetic and fun‑loving nature makes him a popular figure in the classroom, and he is not shy about voicing his honest opinions during class discussions, often mixing sincerity with comedy.

Hamaji has a somewhat gruff exterior but is fundamentally good‑natured and enjoys anything that brings amusement. His favorite snacks are pocky (called Mikado overseas) and crisps. He is the best friend of another classmate, Bootaro, and the two are frequently seen together. Hamaji also spends time with Maruko, as they share a similar playful dynamic.

The character is based on the real‑life classmate of the series' creator, Sakura Momoko. In the story, Hamaji remains a consistent supporting presence, providing light‑hearted moments and serving as a source of comic relief among the third‑grade group. His notable ability is his sharp comedic timing and talent for impersonation, which he uses to lift the mood of those around him. Over the course of the series, he does not undergo major personal development, instead maintaining his role as a cheerful and honest friend within the ensemble.