|Physical and Vital Statistics|
|Manga||Volume 2 Chapter 16|
Yamamoto-kun is a classmate of Kohina Ichimatsu. No matter how you think of it, Yamamoto is an alien. Ever since the time he joined Kohina's class, nobody doubted that he was an Earthling, though it's suspected that he brainwashed everybody.
- Yamamoto's sister is an alien that lives inside of his mouth. It has a snake-like appearance with sharp teeth and glowing blue eyes.
- Yamamoto has made several appearances throughout the show and has made many references to alien-themed movies.
- Yamamoto is a generic surname for a Japanese person.