TV-Series
Description
Rei Nasu commands Nasu Squad among Border's B-rank agents. Her slender frame and pale skin complement her neck-length ash blonde blunt bob with bangs. Her turquoise eyes lack pupils, appearing especially vibrant in her Trion body. She typically wears a futuristic white bodysuit featuring a square collar, purple gloves, an indigo partial waist belt, a right shoulder strap, black shorts, and long purple boots.

Nasu possesses a calm and level-headed nature, anger surfacing rarely, primarily when teammates face threats, such as confronting Wen Sō disguised as Kumagai. Her resolve shines in critical battles, like the matches against Tamakoma Second and Suzunari First, where she fought determinedly to advance her squad before Akane Hiura's departure. Leadership responsibilities weigh on her, evident in her apology after failing to secure four points.

She lives with an unspecified chronic illness contributing to her frail constitution, the reason for her enlistment in Border. This condition also drives her collaboration with Border's research into Trion bodies and health. Despite her physical limitations, she exhibits formidable willpower in combat.

As a Shooter, her primary Triggers are Viper, Meteor, and Lightning. She employs these strategically, like combining Viper's guided bullets with environmental obstacles to outmaneuver foes. During the rank war against Tamakoma Second, she demonstrated tactical skill by positioning herself to cover multiple approaches alone when her squad was compromised.

Relationships with teammates are central, particularly with Yūko Kumagai and operator Sayoko Shiki. She expresses deep loyalty, declaring intent to avenge Kumagai during a confrontation. Her determination is captured in quotes urging her squad to reach the top while they still functioned as a four-member unit.

Nasu enjoys canned peaches, movies, and exercising in her Trion body, attracting numerous secret admirers within Border. Her name carries meanings related to exquisiteness and cleverness, while her surname references a region in Tochigi Prefecture.