It is stated that he has dirty blonde hair, slicked back into a mullet giving him a delinquent style of look. He wears an earring on his left ear.
In his first year of high school, he would often bully Tomohiro Machiya. Only one case of this is shown but it is implied when they meet in the park.
- During his date with Mai Mashiro, Yamamoto took her first kiss.
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