Kuo Shenlin hails from Taipei and has three older brothers. She attends Yurigaoka Girls' Academy, having been enrolled since kindergarten, where she trains as a Lily to combat the Huge alongside fellow students. Shenlin carries herself with elegance and kindness, anchored by a strong sense of justice that drives her to openly oppose actions she views as wrong. Her moral conviction shines through her gentle demeanor. Initially, she harbored jealousy toward her roommate Wang Yujia due to Yujia’s perceived natural talent, though this evolved into a steadfast friendship.

Within Team Hitotsuyanagi, Shenlin fulfills a combat support role, specializing in buffing allies to enhance their effectiveness against the Huge. Her fighting style synergizes seamlessly with Yujia’s long-range sniping capabilities, creating a cohesive partnership. This tactical harmony reflects their growth from roommates to trusted comrades.