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.

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.