Lisa Imai anchors the band Roselia as their bassist. She currently studies at Yotsuba Women's University as a first-year, following her graduation from Haneoka Girls' High School. Her fair skin and green eyes complement long, wavy dark ginger hair featuring lighter streaks, often styled in a partial ponytail with thin bangs. She consistently accessorizes with pink bunny-shaped earrings and lip gloss. Lisa embraces gyaru fashion, blending neutral and black tones for a mature aesthetic. Seasonal outfits include off-the-shoulder tops, miniskirts, knee-high or thigh-high boots, and accessories like decorative chains or bunny-themed jewelry. She removed artificial nails after joining Roselia to facilitate bass playing.

Personality-wise, Lisa radiates friendly, approachable charisma, serving as Roselia's emotional anchor. Despite her flamboyant style, she remains grounded and observant, frequently mediating conflicts and supporting stressed bandmates. She possesses a strong caretaker instinct, often described as "onee-san" or motherly by others. This compels her to notice when others are troubled and offer help, occasionally prioritizing their needs over her own. A hidden hobby of knitting amigurumi contrasts her gyaru image, reflecting a private side she initially kept secret. She dislikes insects, horror genres, and green smoothies, favoring chicken stew (chikuzenni) and sour foods.

Her background centers on a deep, longstanding friendship with childhood next-door neighbor Yukina Minato. This bond defines her musical path: she initially quit bass but resumed playing solely to support Yukina's ambitions. She later auditioned for Roselia, impressing members with her proficiency. Outside the band, she works part-time at a convenience store alongside Moca Aoba, forming a close friendship. Official stories confirm her as an only child, revising earlier mentions of a younger brother following fan feedback.

Key events highlight Lisa's development. In "Don’t Leave Me, Lisa," Roselia's struggle during her absence underscores her irreplaceable role in maintaining group cohesion and morale. This experience deepens the band's appreciation for her, inspiring Sayo Hikawa to learn cooking and motivating Yukina to strengthen bonds. Later, in "Neo Aspect," Lisa consciously reduces her dependency on Yukina, fostering independence in their relationship while deepening connections with other Roselia members. Initial self-doubt about her musical skills gradually resolves as she accepts her value within the band, openly embracing her identity as a proud member.

Additional traits include her skill in ticket sales for live events and possession of a driver's license obtained after high school. Her image color, #c8463b (a shade of red), symbolizes her warm, stabilizing presence. Lisa interacts sociably with members across all franchise bands.