Saia Aiuchi (???, ???) teaches class 1-9 in First Shibuya High School in the Seraph of the End: Guren Ichinose: Catastrophe at Sixteen light novels.
As a standard member of the Order of the Imperial Demons, she practically worships the Hiragi Clan and scorns the Ichinose Clan. Even as a teacher, she disregards fairness and equality and mocks Guren starting as soon as class begins.
Soon after roll call, she immediately calls Guren a rat. She is nervous around Shinya due to his last name. Shinya asks if it is really ok for her to call a student a rat and she does not reply.