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Minku Umibe (海辺 みんく, Umibe Minku) is a student in Siegfeld Institute of Music's Junior High Department, introduced as a cast member of the stage play Shōjo☆Kageki Revue Starlight -The LIVE Edel- Delight and scheduled for implementation in Shōjo☆Kageki Revue Starlight Re LIVE in summer 2022.
Always spacey, the free spirit of Siegfeld who walks her own path. Though she has great singing and dancing skills, her grades aren't good due to expressing herself and ad-libbing too freely. She takes supplementary lessons with Ryoko Kobato, and they are often together. She's currently searching for what kind of stage girl she would like to be. 
Minku has yellow hair that fades down into pink. She wears her hair in a thick braid behind her head that then splits apart into two hair strands curving upwards. She has green eyes.
Minku's school uniform consists of a cream- colored collared formal jacket which she wears opened. On her left shoulder is the Siegfeld school emblem. The sleeves cuffs are black with a beige stripe in the center. She wears a white collared shirt underneath two red tight straps that attach to her skirt.. Attached to the white shirt is a dark purple bow. The ends of the bow reach her stomach. The bow has a red center. She wears a checkered black pleated skirt. She wears red sneakers with yellow socks.
Minku grew in the mountains.
They often end up in supplementary lessons together. So, they are often with each other. Her nickname for her is "ryonryon".
They are childhood friends.
- The name Minku likely comes from "mink", spelled in Japanese as ミンク (minku).
- Further evidence of this is her being represented by an otter emoji in an official Tweet.
- Minku's surname Umibe (海辺) means "seaside".