|Birthday Date||June 12|
|Hair Color||Ocean blue|
|Debut||Episode 1 - I'll Become The Top Idol!|
|Singing Voice||Mona from STAR☆ANIS|
|Theme Song(s)||Undersea Treasure|
Love Knows It
|Aura||Bubbles, pink seahorses, yellow fish|
|School Coord||Gold Love Coord|
Shinju has medium-length ocean blue hair and grey eyes. She is usually depicted wearing her school uniform. Whenever she is in public, Shinju wears a light blue zip-up shirt with black lining, denim shorts and light blue sandals. She is shown to never take off her pink glove, even when she is in school uniform.
Shinju is fun-loving and loves to sing and dance. She is full of jokes to make her friends laugh and is athletic. She has also been Masami Amanogawa's best friend since childhood, and is her roommate. Shinju can also be quite rebellious at times.
Masami Amanogawa - Masami and Shinju have been best friends since childhood, and both are roommates at Starlight Academy.
Umino (海野): Umi (海) means "sea" while No (野) means "field".
Shinju (心中): Shinju means "pearl".
Therefore, her name means "sea field pearl".
Shinju's singing voice actress, Mona from STAR☆ANIS, has provided her voice in image songs for Shinju.
- Lalala Aikatsu Start! (along with Yuna, Remi and Eri from STAR☆ANIS)
- Egao o Arigatou ~BRAND NEW DAY~ (along with Yuna, Remi and Eri from STAR☆ANIS)
- Shinju shares her singing voice with Mikuru Natsuki and Sumire Hikami.
- Her zodiac sign is Gemini.
- Shinju is the first deuteragonist to be a pop-type idol.
- Her aura is composed of bubbles, seahorses and fish.