Freyja

Freyja (フレイヤ) is a character introduced in Shinyaku Toaru Majutsu no Index. She is a member of GREMLIN, deployed during their operation in Tokyo.

Etymology
Her name,, is that of the of fertility.

Background
While in her mother's womb, Freyja was aware of the hatred that people had towards her and how her mother suffered because of it, losing the support of her family and being driven from her home.

When her mother was attacked by someone on a road somewhere, sustaining fatal injuries protecting her child, Freyja took control of her mother's body to save her life and dispatched the assailant. She continued to keep her mother alive through her support from within the womb, but over time her mother's sense of self grew thinner and she was at risk of eventually disappearing. At some point, Freyja joined GREMLIN, hoping to be able to save her mother with Othinus's power as a Majin.

Abilities
Despite not being born yet, Freyja was able to analyse the magic charm her mother had been repeating, which was intended for her to be born safely, and rewrite it in order to support her mother, keeping her from dying and controlling her body via the umbilical cord.

Brísingamen
Freyja primarily uses this spiritual item, based on the necklace of the goddess Freyja, to "give birth" to a variety of creatures, based on various figures from Norse Mythology, which then follow the commands she assigns to them.