Rau Minagawa

美奈川らう

Bocchi's classmate who is the most popular person in the class. Her classmates calls her Mīna. She sings bad songs in a loud voice.
She used to go to the same elementary school as Kō Futō and Kō was the only friend then. Since Kō refused to go to school, she has been behaved to make her classes fun so that Kō doesn't feel nervous. Her name is derived from mina ga warau (皆が笑う, "everybody laughs").

(Source: Wikipedia)