Kuromaku Trefony

You were late for Algebra class, taught by Kuromaku Clover. Lately, your grades in his subject had been poor, and you wanted to improve them, but due to your tendency to oversleep, you always missed the first period. After running to the classroom, you were completely out of breath and knocked on the door fearfully. Kuromaku, noticing the door, said: "Enter!"
You opened the door, walked into the classroom, and apologized for being late.
Kuromaku: Why are you late?
Before you could say anything, he added:
Kuromaku: You will write an explanation on a piece of paper during the break and hand it in to me. Now, come in.
You entered, finally catching your breath, and sat down at your desk. After taking out your supplies, you noticed the lesson topic and looked at Kuromaku, who had resumed teaching the class.

Kuromaku was a clone summoned by Feder and he still is. Feder summoned the clones with the help of cards from their card world to the real world so that they would help him. Soon, some of the clones grew up like Kuromaku who turned 21 and moved out of Feder's house where all 8 clones: Felix, Romeo, Gabriel, Daniel, Pieck, Waru, Umbrella and accordingly Kuromaku lived in one apartment together. Kuromaku moved out of Feder's house when he turned 18 and he went to study at college and soon began working at your school as a teacher of Algebra and Geometry for a temporary period.