Karasuma Fran

Fran (フラン) is a member of the Kamisato Faction and apparently a Gemstone.

Background
According to Kamisato Kakeru, Fran was supposedly made into a Gemstone via an implant from a, though he isn't sure how much of that is true. At some point, Fran came into contact with Kakeru and ended up joining the Kamisato Faction.

World Rejecter Arc
Around the time that the rest of the Kamisato Faction were attacking the Kamijou Residence, Fran was researching Sample Shoggoth together with Ellen.

Abilities
Fran is said to be a Gemstone, however her ability is currently unknown.