Nishi is one of the Mazoku Quartet he himself was imprisoned inside school by Astronova kind after around few centuries they were freed from a basement seal he himself throws "ambiguous"(aka borderline schizo) "facts"(aka words that sound smart but are utter bs) Nishi loves to humiliate his targets as his goal is to cause chaos at school at orders of Akujo so they can find anything that will help them build a gate to makai the planet Mazoku come from he is easy to confuse if faced with argument.