Mitsuya Takanashi is a supporting character in the anime Real Girl. He is a popular and handsome high school student, distinguished by his short blonde hair and brown eyes. His good looks and confident personality earn him the label of an ikemen among his classmates, and he is well-liked by many. Mitsuya frequently flirts with Iroha Igarashi, the female protagonist, but his advances are always rejected. This unrequited interest fuels a strong sense of rivalry toward Hikari Tsutsui, the male lead, of whom Mitsuya becomes intensely jealous. His jealousy occasionally leads him to spread false rumors about Hikari in an attempt to undermine him.

Despite his charming and sometimes antagonistic exterior, Mitsuya has a deeply caring side, especially toward his younger sister, Anzu. He loves her dearly and is protective of her wellbeing. This relationship reveals a more sincere and vulnerable part of his character. He is not immune to recognizing his own faults; when Hikari helps resolve a misunderstanding between Mitsuya and Anzu, Mitsuya shows genuine gratitude and remorse, proving he is capable of self-reflection and change.

In the overall narrative, Mitsuya acts as a rival to Hikari, creating friction and contributing to the romantic tension. He also serves as a catalyst for character growth, as his actions force both Hikari and Iroha to confront issues of jealousy, trust, and communication. Over the course of the series, Mitsuya develops from a superficial flirt into a more layered individual who learns to acknowledge his mistakes and value his relationships. His notable abilities lie in his social influence and popularity, which he sometimes uses manipulatively, but also in his capacity for emotional honesty when faced with the consequences of his behavior. These qualities make him a significant supporting figure in the story.