Umi Hioki is a character of Idol Jihen. She is part of the Sunlight Party.
Umi has large emerald eyes and fair skin with medium-length dark blonde hair. Most of her hair is worn loose with a sidetail on the left of her head, held by two Uni/Sea Urchin. She has thick bangs with a tent at the left corner and thick forelocks covering her ears.
She wears a simple outfit composted of a white tank-top, an emerald and burgundy pleat check skirt and matching sweater with a pink star button on each wrist, white toed socks, and a pair of chinese idols. On her neck is a turquoise necklace with a single pearl and a matching bracelet.
- Her birthday is February 12.
- Her blood type is AB.
- She resembles Honoka Kosaka from Love Live'!'
- She shares her first name with Umi Sonada from the same series.