花梨

A mysterious girl claiming to be a sorcerer who suddenly tried to occupy the school with the goal of flying.
Though she strongly resembles Torii Karin, who had previously occupied Mizuho Academy, Karin herself has no idea who she is.
.

Karin is implied to actually be Kumonomi Misora's "Magical Weapon of Tactical Destruction", having manifested herself shortly after Misora received a "Magical Gemstone" (OOPArt) from Sagara Maiko (Who herself got it from Sagara Ichigo).