Lisa Imai is the bassist for the band Roselia in the BanG Dream! franchise. Her flamboyant gyaru fashion projects an initial image of frivolity, sharply contrasting her true personality. She is compassionate, faithful, and mature, frequently acting as the band's mediator. Her attentiveness allows her to detect distress in others and offer support, sometimes prioritizing their needs over her own. This earned her the affectionate nickname "onee-san" and comparisons to a maternal figure, crucial for maintaining Roselia's cohesion.

She shares a long-standing friendship with Yukina Minato, their personalities contrasting—Lisa's sociable and adaptable nature against Yukina's reserve. Lisa attends Yotsuba Women's University as a first-year student in the Faculty of International Studies and maintains friendships outside Roselia, such as with Moca Aoba. She conceals her interest in knitting, fearing it conflicts with her gyaru identity. She also enjoys baking cookies and demonstrates proficiency in selling concert tickets, reflecting her social skills.

Her preferences include liking chicken stew and sour foods, while disliking green smoothies. She has a documented aversion to insects and horror-related content. A controversy arose when an event story introduced a younger brother, contradicting her established background as an only child known for caretaking neighborhood children. The writing staff acknowledged this inconsistency as an error, removing all sibling references and re-recording affected dialogue to preserve her original character arc.

Lisa appears across multiple BanG Dream! anime seasons, films including *BanG Dream! FILM LIVE 2nd Stage*, OVAs like *Garupa Pico*, the *Girls Band Party!* video game, and the *Roselia Stage* manga. Her instrument, the BTL bass guitar, has been commercially produced by ESP Guitars as franchise merchandise. Her light form epitomizes the gyaru subculture, creating a thematic contrast with Yukina's traditional Yamato Nadeshiko archetype.