She's a supporting character appearing in Toaru Majutsu no Index side stories, particularly in Kanzaki SS.
A 12-year-old girl with short blonde hair, green eyes, and a small frame, she typically wears a pink-orange dress. She's the younger sister of Patricia Birdway and a skilled magician who's turned down recruitment offers from multiple organizations without hesitation.
Her first real encounter with Touma comes when he stumbles into a meeting for her group—an organization called the Dawn-colored Sunlight—leading to a mix-up where everyone assumes he's a spy from a rival faction. Turns out she's actually running the whole operation, which is pretty notable given her age.
She pops up again near the end of New Testament volume one, where she pulls Touma, Shiage, and Accelerator aside for an impromptu lecture on magic, magical organizations, and the looming threat both the magic and science sides are about to face. She's not positioned as an antagonist, but she clearly knows far more than she should about what's really going on behind the scenes—including details about World War III that the three boys definitely didn't have before.
Content compiled by AnimeList.moe from publicly available sources.
