三ノ宮 ルイーズ 優衣

Birthday: November 1, 2016 (Scorpius)
Blood Type: A+
Occupation: Rokumei City Private Academy High School Section, Class 1-B
Intelligence: Very High
Physical Strength: Greater than it looks (she's particularly good at aikido-esque techniques)
Hobbies: Reading (especially sci-fi novels)
Likes: Sci-fi works, being alone, building up her knowledge and fighting techniques, looking at the stars, delicious food
Dislikes: Idle conversations and ambiguity, empty words, having her personal space intruded upon, hunger
Enneagram: Type 4 "The Individualist"

Half-Japanese, half-French. A young yet bright genius who skipped two grades.
"Yui" is her middle name, while "Louise" is her first name. "Salyu" is her nickname.

A girl with a difficult to approach air about her that contains a mystique far removed from normal people.
She is of very few words, and her expression rarely changes.

She's not oppressive, but nor does she attempt to make any friends of her own.
Despite that, she appears actively conscious of Natsuhiko. She constantly carries a ferret mascot-type robot called "Alice".

She transfer into Natsuhiko and Mashiro's high school early on in √B.
It appears she's a distant relative of Natsuhiko's, as she moves into Natsuhiko's house right after she transfers...

She somehow gets trapped in LABO on September 16.
Furthermore, she runs away from the rescue squad after they find her and try to save her. A mysterious girl indeed.