Lisa, also known as Fujimatsu, is a female student with purple hair who holds the role of class president. She develops romantic feelings for the protagonist, Hibio (referred to as Eric in English adaptations), though he typically resents her and other females. Descriptions imply her intellectual sharpness is limited, noting that "her lights aren't all turned on upstairs."

She carries a bow and arrows as her notable possession. This armament becomes significant when her affection for Hibio/Eric sparks direct conflict with Bala (Nima in Japanese versions), the primary female character who arrives claiming marriage rights to him. Their rivalry culminates in a duel between Lisa and Bala.