Overview
Bocchi-chan (ぼっちちゃん) is a nickname derived from the Japanese word 'Hitori bocchi', meaning 'alone'.
On pixiv, it often refers to Hitori Gotoh (後藤ひとり), the protagonist of the manga Bocchi the Rock! (ぼっち・ざ・ろっく!).
Also, Bocchi Hitori (一里ぼっち), the protagonist of the manga Hitori Bocchi no Marumaru Seikatsu (ひとりぼっちの○○生活), can also be referred to by this nickname.