Instead of a left hand she has a large circle (compass), with the help of wich she kills students who received and F. She has black long hair. Height ≈180-190 (?).
Character from KAAATIE (youtube) 

The most beautiful math teacher, who like oreo. 

https://fundamental-paper-education.fandom.com/wiki/Oliver
https://fundamental-paper-education.fandom.com/wiki/Zip
Oliver is an 18-year-old boy (probably 180cm tall). Zip is a girl who is probably 165cm tall.
Edgar is most likely something like a third extra in their company, but he's still with them lol

Fundamental Paper Education

Miss Circle was leading the class on the math question and if they got an F, She would kill and torture them before the student even dies (and eat (?) them; No one in class or school knows this). Instead og her left hand, she has a huge circle (compass), with the help of which she kills students. She has long black hair that reaches about her knees(?), and she is about 180-190cm tall

KAAATIE's character from youtube 