Lisa Imai anchors the gothic rock band Roselia as their bassist while studying International Studies as a first-year at Yotsuba Women's University. Her signature gyaru style features dark ginger hair with lighter streaks, styled in a partial ponytail with curled forelocks and long bangs, consistently accented by lip gloss and distinctive upside-down bunny-shaped earrings with a matching necklace. She abandoned artificial nails to focus on bass. Her wardrobe mixes neutral and black tones seasonally: off-the-shoulder dresses with knee-high boots, winter maroon shirts with miniskirts and thigh-high boots, and summer graphic tees with denim shorts.

Outwardly friendly, lively, and mature, Lisa acts as Roselia's mediator, prioritizing others' well-being, sometimes to her own detriment. Her keen observation allows her to quickly detect friends' struggles and offer support, embodying a self-described "onee-san" role others compare to a maternal figure. Despite impressing Roselia at her audition, she initially saw herself as the least skilled, battling self-doubt. She secretly enjoys knitting amigurumi and baking, fearing these clash with her image, dislikes insects and horror, but excels at selling concert tickets.

Her life centers on a deep, lifelong friendship with next-door neighbor Yukina Minato. She works part-time at a convenience store with Moca Aoba, sharing the same height. Lisa interacts casually with peers, using first names, while applying "-san" honorifics to adults, and maintains connections across bands like with Sayo Hikawa and Rinko Shirokane.

Key events shape her growth. Roselia struggles without her in "Don’t Leave Me, Lisa," underscoring her crucial role in group cohesion. Bandmates note her improved bass skills in "Umbrella for the Autumn Rain." The "Neo-Aspect" event marks significant personal evolution: recognizing her tendency to overly coddle Yukina, she consciously steps back to allow her friend autonomy, simultaneously strengthening bonds with other Roselia members. This bolsters her confidence, solidifying her identity as a proud member.

Trivia notes include a retconned younger brother detail, removed due to fan-noted inconsistencies with her established status as an only child. After high school, she pursued a driver's license. Cultural perceptions differ: Japanese fans emphasize her "onee-san" archetype, while Western interpretations highlight motherly qualities. Her Chinese name incorporates "莉" (jasmine), though her Japanese name holds no specific meaning.