Fumika Narutaki attends Mahora Academy in Class 2/3-A as the younger twin sister of Fuka Narutaki. The sisters share identical physical characteristics: standing 128 cm tall, weighing 54.3 kg, with measurements of B62-W46-H55, pink hair, and blue eyes; Fumika is sometimes distinguished by lighter blue or violet eye color. Born December 6, 1988, with blood type A, they are the shortest in their class and retain a childlike appearance due to not yet undergoing puberty. Fumika displays a cautious and reserved personality, contrasting with her sister's mischievous nature. Her hobbies include cleaning and eating sweet foods, while she dislikes hairy, long objects like caterpillars. She belongs to the Strolling Club with Fuka and Kaede Nagase, familiarizing themselves with campus locations and assisting with tours, and also participates in the Beautification Committee. Though the twins claim ninjutsu training from Kaede, their skills remain rudimentary, limited to eavesdropping and wearing ninja outfits during activities like the "Kiss Negi" contest in Kyoto. During the Kyoto trip, Fumika and Fuka simultaneously kissed a copy of Negi Springfield in an attempt to form a Pactio contract, resulting in a botched "Geminae Simulatrices" card binding both sisters to a single artifact. This shared Pactio card grants shadow doppelganger techniques in some adaptations. In the "Negima!" anime adaptation, Fumika's personality merges with Fuka's mischievous traits, while "Negima!?" restores her original cautious characterization. During the Christmas after the Magical World arc, Fumika and Fuka encountered two animals revealed as magic princes in disguise, leading to lasting connections referenced in the epilogue and "UQ Holder!". In the Magic World arc, Fumika accompanied her classmates to Mundus Magicus as part of Ala Alba. After returning to Mahora, she participated in the events surrounding the graduation ceremony. The epilogue reveals Fumika and Fuka married immediately after high school, settling near Ariadne in the Hellas Empire's borderlands and raising daughters, noted as the first in their class to marry and have children. Regarding "Mahō Sensei Negima! Anime Final", the film focuses on Negi selecting a permanent Pactio partner before memory erasure; Fumika's specific role or contributions are not detailed. Fumika's character development emphasizes her supportive role to her sister and quieter presence within the class. Her narrative concludes with a peaceful family life in the epilogue, aligning with her preference for stability.