Frenda Seivelun, of Norwegian descent, operates within Academy City's dark side as a member of the ITEM organization. She maintains a concealed hideout inside the Dianoid shopping mall and actively hides aspects of her personal life from both the underworld and mainstream society. She possesses a younger sister, Fremea Seivelun, whose existence remained unknown to other ITEM members until after Frenda's death. Frenda also forms a surrogate sibling bond with Shinka Kanou, preparing birthday gifts and offering him emotional support, reflecting her extensive social network encompassing thousands of contacts across Academy City. Her interpersonal approach blends genuine care with transactional convenience; she demonstrates loyalty to friends and repays debts, such as defending Ruiko Saten after receiving a meal, yet shows willingness to betray allies for self-preservation. This complex behavior extends to her ITEM teammates, whom she considers friends despite her treacherous tendencies under threat. Frenda frequently uses the term "Kekkyoku" (translated as "In the end," "Basically," or "All told") in speech, a trait shared with her sister. Functioning as a primary ITEM combatant despite being a Level 0 esper, Frenda compensates with specialized equipment and tactical skill. Her combat methodology emphasizes explosives mastery and trap deployment, utilizing remote-controlled bombs concealed within dolls and stuffed animals, including ceramic fragmentation and thermobaric variants. Her arsenal includes small pyramid-shaped adhesive bombs, handheld anti-tank missile launchers capable of structural damage, and Ignis gas—an explosive vapor activated by sparks. She is also proficient in close-quarters combat, employing agility, surprise drop kicks, slides, throws, and a concealed stiletto blade in her left shoe. Her strategy involves misdirection through humorous remarks and environmental preparation, such as lining areas with explosive tape fuses to counter electromasters, though she exhibits overconfidence when gaining an advantage. Within ITEM, she serves under Shizuri Mugino, maintaining a subservient dynamic marked by frequent scolding for unprofessional behavior alongside underlying admiration. Frenda's narrative spans events preceding the main series timeline, evolving from a minor role to greater prominence through subsequent appearances and flashbacks. Her involvement includes Academy City dark side missions and interactions revealing her multifaceted personality, ranging from casual teenage interests like shopping and fashion to ruthless efficiency during assignments. Her demise results from betrayal during internal ITEM conflict, leading to her being bisected at the waist by Mugino's Meltdowner ability. This event is later referenced visually in other media and memorialized in fan culture through the deliberate spacing "Fre nda." Her legacy persists through influences on surviving characters like Fremea and the retrospective exploration of ITEM's formation in the "Toaru Anbu no Item" spinoff, where she appears as a core member.