Minori Watanabe is a former flower shop manager who becomes a physical-type idol under 315 Production as a member of the unit Beit, alongside Pierre and Kyoji. Prior to his idol career, he worked in a flower shop, a background that influences his calm and polite outward demeanor. However, he was once a delinquent in his youth, a past that occasionally surfaces when he needs to scold or threaten someone with a composed expression. This contrast between his gentle floral imagery and his hidden toughness defines much of his character.

His motivation to become an idol stems from his uncle, who introduced him to the world of idol fandom. Minori developed a deep admiration for groups like Ryuuguu Komachi and Jupiter, and his passion for idols eventually led him to join 315 Production to better understand what makes idols so appealing to their fans. He possesses extensive and intricate fan knowledge, which he often uses to guide his unitmates Pierre and Kyoji on how to best connect with their audience. He also has a habit of comparing people to flowers when speaking about them, reflecting his florist background.

Within the story of The Idolm@ster SideM Wake Atte Mini!, Minori appears as a supporting character, continuing his role as a thoughtful and occasionally stern member of Beit. His relationships with Pierre and Kyoji are central to his development; he acts as a mentor figure who shares his expertise while also learning to balance his own earnest passion with the more lighthearted moments of idol life. His notable abilities include his physical idol type, his power of observation regarding fan expectations, and his unique talent for using floral metaphors to convey his thoughts and feelings.