"Arisa is one of the main characters in the Japanese manga ""My Classmate Was a Dude"". She is a high school student who attends the same school as the protagonist, Mizuki.

Arisa is described as an energetic and outgoing girl with a friendly personality. She is often seen hanging out with her friends, including Mizuki, and is known for her lively sense of humor.

Despite her bubbly exterior, Arisa has a serious side. She is a talented artist who dreams of becoming a professional mangaka. She spends much of her free time drawing and submitting her work to various manga competitions.

When the manga's protagonist, Mizuki, reveals that she is transgender and was assigned male at birth, Arisa is one of the first people to offer her support. She is highly accepting of Mizuki's true identity and frequently stands up for her against those who discriminate against her.

Despite her young age, Arisa is shown to have a deep understanding of complex social issues. She is often shown contemplating the meaning of gender and sexuality, and is an active advocate for LGBTQ+ rights.

Overall, Arisa is a dynamic and multifaceted character who adds depth and complexity to the story. Her unwavering support of Mizuki and her passionate advocacy for equality make her a beloved character among fans of ""My Classmate Was a Dude""."