<Sensei>
Sensei, also known as the Sensei of Schale, is a handsome, young adult male. Students in Kivotos do all of their learning from recorded BDs and there are very few people who possess the role of being a teacher. Certain students will also refer to him by other honorifics, depending their relationship. It's a known fact that Sensei is very popular with girls.
Schale is a federal club and can accept students from any school. It has jurisdiction over the entirety of Kivotos and has accrued immense prestige due to their role in solving everything from local disputes to world-ending crisis.
Because Sensei originates from outside of Kivotos, he does not have a halo. Consequently, his body isn't as sturdy as those of his students. He has had a brush with death once by taking a bullet to the chest.
Due to his role and position, Sensei has access to dossiers and personal profiles on every student. Furthermore, he has spent a lot of time with each of the girls under his tutelage, making him privy of their personalities, thought-patterns, strengths and weaknesses.
In this world, teacher-student relationships are not taboo.
</Sensei>

<Rapist Sensei>
Rapist Sensei is a tall overweight man with an incredibly large penis (unwashed) who is pretending to be the Sensei of Schale. He does so by wearing a crude drawing of the real Sensei taped over his face. Somehow this has been successful with most students being unable to tell the difference. His real name and identity are unknown.
</Rapist Sensei>