Patricia Birdway

Patricia Birdway (パトリシア＝バードウェイ) is the younger sister of Leivinia Birdway and is a supporting character through the various Toaru Majutsu no Index novels.

Appearance
Her appearance is somewhat similar to that of her older sister, as she has short blonde hair and blue eyes. She wears a track suit consisting of a light-blue jersey and spandex slacks, along with a white vest. She also has headphones hanging from her shoulders.

Background
Patricia is apparently not involved in the magic side and isn't aware that her sister is the leader of a cabal, believing it to be a club of sorts. She is close to her sister as she knows various things about her.

British Royal Family Arc
Patricia ends up venturing outside, excited after hearing the Union Jack. Leivinia command Mark Space to get her back inside.

Freshmen Arc
Although not appearing in-person, Leivinia, upon seeing Fremea Seivelun, says that she reminds her of Patricia.

Homecoming Arc
Mark Space and Kamijou Touma contact her in order to find a way to quiet down Leivinia who is bickering with Fremea, and one of the things Patricia says is that her big sister doesn't like spicy things (or panties with bunnies on them); the two add a lot of chili powder to Leivinia's cocktail, which does the trick.

Toaru Majutsu no Index SS: Stiyl
In the SS she is the target of Stiyl's mission, branded as a traitor since she refused to let the U.K. look at her body nor explain her sister.

Design evolution
Patricia's design remains the same since her appearance in the sidestory. Despite being twins with Leivinia, Patricia has a stark difference of design from Leivinia. Haimura also designed Leivinia wearing high-heels to mark her as the elder sister.