Lisa Isaribi possesses light red hair arranged in a knotted ponytail with separate bangs and light burnt orange eyes. Her body features distinctive dark horizontal striped tattoos on her upper left arm and right thigh. She initially wore white gloves, a white crop top, dark jeans with the left leg cut off to reveal her thigh tattoo, and a white tool belt with a skull buckle. Upon joining Special Fire Force Company 8, she adopted the orange company jumpsuit worn open to expose a black crop top underneath, paired with black boots. Orphaned by an Infernal attack that traumatized her, Lisa was taken in by Dr. Giovanni of the White-Clad. He subjected her to an artificial "Bug" experiment, transforming her into a Third Generation pyrokinetic. Giovanni brainwashed her over years, fostering a deep fear of abandonment alongside her terror of him. Under the codename "Feeler," she infiltrated Vulcan's workshop as a vulnerable refugee named Lisa. While secretly reporting to Giovanni and searching for the "key to Amaterasu," she formed genuine emotional bonds with Vulcan Joseph and the teenager Yū, creating a familial dynamic. Her betrayal occurred during the assault on Vulcan's workshop. Revealing her allegiance to the White-Clad, she attacked Vulcan and Yū, using her pyrokinetic abilities to incapacitate Yū and electrocuting Vulcan with a taser. Despite her ruthless actions, she displayed internal conflict, hesitating when Vulcan urged her to escape with him. She remained with Giovanni out of fear and ingrained conditioning. Fighting against Vulcan and Company 8 Captain Akitaru Ōbi in the Netherworld as a Knight of the Ashen Flame, her resolve wavered when Vulcan stated he entered specifically to rescue her. After Ōbi disabled her powers using Extinguishing Grenades, Vulcan caught her as she fell, triggering an emotional breakdown. Giovanni then used her as a hostage, threatening her life to force Vulcan to shoot Ōbi. Following a counterattack that drove Giovanni into retreat, she pleaded for him not to abandon her. Vulcan carried her out, and she received medical care at a fire defense clinic, haunted by the experience. Recovering under Company 8's protection, she formally joined the brigade. Expressing gratitude for being welcomed, she gradually developed camaraderie. Flashbacks to Giovanni triggered intense fear, but her loyalty solidified when she participated in the mission to rescue Ōbi after his arrest, declaring he had "saved her from darkness." Her combat abilities proved instrumental against the White-Clad operative Gold, where her magnetic pyrokinetic powers neutralized Gold's similar abilities. Her development culminated in confronting Giovanni during the defense of Amaterasu. Initially paralyzed by fear, she drew strength from Vulcan's encouragement, openly defied Giovanni, and aided in his defeat. When Giovanni possessed Yū to manipulate her, she was overwhelmed until Arthur Boyle freed Yū. This led to an emotional reunion with Yū where she cried tears of relief. Her pyrokinetic abilities allow her to generate octopus-like tentacles of fire from surfaces or her waist. These tentacles possess magnetic properties, enabling them to lock onto the magnetic fields of living beings or machines, a trait exploitable if opponents disrupt the fields with stronger external sources. She self-identifies as a crybaby, favors punk music due to Vulcan's influence, and aspires to marry and have children. She dislikes spicy food, excels in science but struggles with math, respects Vulcan, and harbors intense hatred and fear of Dr. Giovanni.