TV-Series
Description
Aiko Senoo hails from Osaka's Tengachaya, transferring to Misora after her taxi driver father's job relocation. She speaks with a distinctive Kansai dialect and reacts negatively to others imitating it. Her parents divorced when she was young; she internalized the event as her fault after overhearing them argue following a childhood injury. Choosing to live with her father, believing he needed her more, she maintains a private relationship with her mother while harboring deep sadness over their separation. Her background includes exposure to her grandfather's violence toward her mother, creating a lasting fear of older male relatives.

Athletic and sporty, Aiko excels in physical activities but hides an inability to swim due to childhood embarrassment. Her personality blends boldness, practicality, and an Osaka comedic flair, though her bluntness can unintentionally seem rude. Despite academic struggles, she tackles challenges with enthusiasm and humility, often sought for advice. She masks insecurities and past trauma, disliking displays of vulnerability, yet demonstrates mature responsibility co-raising the magical baby Hana, whom she fiercely protects.

Her journey as a witch apprentice starts after accidentally witnessing Doremi's magic, leading Majorika to recruit her to maintain secrecy. Represented by sky blue, her fairy partner is Mimi. Her magical tools include a harmonica-like "Tap" for transformations and a diamond-shaped crystal ball. Her spells, like "Pameruku Raruku Rarirori Poppun!", evolve alongside her Pollon wand across seasons. She masters broom flight early, often riding cross-legged, and adapts to upgraded tools like the "Parara Tap" and "Sweet Pollon".

Key relationships define her development. She initially clashes with Doremi but forms a close, teasing bond. With sensitive Hazuki, she balances encouragement and stern guidance. She distrusts manipulative Onpu Segawa early on, later bonding over shared level-headedness. She helps Momoko Asuka navigate social missteps from cultural confusion, tolerating her eccentricities despite annoyance. She admires Nobuko Yokokawa after initial anger over lies, recognizing Nobuko's desire for friendship. Her rivalries include Leon of FLAT4, whom she defeats in sports but finds irritating for his English phrases. A childhood promise to marry Keiichi Harima resurfaces in the OVA *Na-i-sho*, revealing her care for him without reciprocating romantic feelings.

Her growth involves confronting past traumas, notably overcoming her fear of grandfathers during a Fukuyama trip in the film *Secret of the Frog Stone*. Across the series, she grapples with hopes for family reconciliation and learns to lower emotional defenses, particularly concerning her mother. In the finale, she chooses to relinquish witchcraft to remain human, valuing ordinary life with friends. The light novels and *Ojamajo Doremi 16–20's* continuation explore her adulthood, including potential reunions and unresolved feelings toward Keiichi.