ニチ・ケイト

Class Rep in Takuto's class who sits in front of him. She is also known as Ivrogne, the leader of the Glittering Star's third section, the "Bougainvilleae" Squad. 
She is the East Maiden (ひが日死の巫女, Higanishi no Moki), unbeknownst to everyone in the Glittering Star Crusade, except apparently for Head and Camel Star, who keep it a secret to themselves so that the final two seals can be broken simultaneously, thus preventing pilots from being trapped in Zero Time./ 

In her childhood she was friends with Shindou Sugata and Agemaki Wako, and like Wako she was inspired to become a singer. She gives up on her dream apparently due to being a maiden but still sings privately at the karaoke bar she works at. She seemingly harbors feelings towards Sugata, whose room serves as the location where she performs rituals as a maiden. After confronting Sugata about her position as the East Maiden and he joins the Glittering Crux as King, she apprivoises and has Head break her seal unleashing the fourth phase and releasing Samekh. At the end, she said to Wako that at the end, Sugata still belongs to her after all as she realizes that Wako understood Sugata much more than she did./

From url=https://en.wikipedia.org/wiki/List_of_Star_Driver_characters##Glittering_Crux_Brigade.