Kili Surtr Muspelheim
キーリ・スルト・ムスペルヘイム
She is the leader of the Dragon Cultist, who tries to get Tear back but was thwarted by Yuu.
She is a D, but has been deemed a disaster by NIFL, and so is treated as a dragon.
She is introduced as Tachikawa Honoka, but later reveals her true identity.