Pico

ぴこ

Pico is a blonde pre-adolescent boy who works part-time at his grandfather's bar during the summer. He is frequently depicted swimming, typically naked or wearing a blue speedo. Following Tamotsu's suggestion, he begins wearing girls' clothing. Later, feeling hurt that Tamotsu refused to define their relationship, Pico rebels by cutting off most of his hair and running away.
The following summer, while cycling, Pico spots Chico swimming nude in a stream. He soon befriends the other boy, who addresses him as "oniichan" and enters into a sexual relationship with him. In his relationships with both Tamotsu and Chico, he serves as the uke, although the dynamic with the latter is somewhat reversible.