TV-Series
Description
Mitsuki Izumi is the older brother of Iori Izumi and a member of the idol group IDOLiSH7. He serves as the group's primary mood-maker and excels at emceeing, often taking on the role of the straight man during comedic exchanges with his sub-unit members Yamato Nikaido and Nagi Rokuya. Mitsuki is energetic, optimistic, and determined about his work as an idol, a career he has dreamed of since childhood after a visit from the legendary idol ZERO to his family's bakery, Fonte Chocolat. He acts as a caretaker figure within the group, frequently cooking meals for the other members and looking out for the younger ones in a brotherly manner.

Despite his outwardly cheerful and confident demeanor, Mitsuki harbors deep self-consciousness and struggles with a lack of self-love. He is acutely aware of his lower popularity compared to other members and worries that fans may find him annoying due to his constant speaking role. This insecurity is rooted in his past: before joining IDOLiSH7, he faced numerous failed auditions, often attributed to his short stature, and developed a complex because his younger brother Iori seemed to succeed effortlessly. A quarrel between the brothers over Iori's suggestion that Mitsuki market himself as cute highlighted Mitsuki's desire to stay true to himself. He was ultimately able to join IDOLiSH7 when Iori accepted a scouting offer from Otoharu Takanashi only on the condition that Mitsuki could audition as well, though Otoharu later insisted that Mitsuki's talent was the real reason for his acceptance.

His role in the story is that of a stabilizer and emotional support for the group. He often intervenes to defuse tension and lifts the spirits of his fellow members during difficult times. When bullies confronted IDOLiSH7, Mitsuki stepped forward alone to protect the others, sustaining injuries in the process. He is also physically capable, a strong swimmer who once saved Nagi and Riku from drowning. Within the group, he forms a close bond with his sub-unit Pythagoras Trio, acting as the grounded foil to Yamato and Nagi's antics. His relationship with Iori is central to his character; despite their past friction, Mitsuki is usually the first to apologize after disagreements, and he deeply cares for his younger brother.

Over the course of the story, Mitsuki's development centers on learning to value his own contributions and talents. While he remains prone to self-doubt, recognition from industry professionals and his own growing confidence in his emceeing abilities gradually help him see that he truly belongs in IDOLiSH7. His determination to live his one and only life fully, as expressed in his personal motto, remains a defining aspect of his character. Notable abilities include his exceptional MC skills, which are highly respected within the entertainment industry, his cooking talent, and his ability to maintain a warm and lively atmosphere wherever he goes.