One of the leaders of the class terrorism, he’s turned to Onizuka’s side fairly quickly. He’s somewhat rebellious, which is evident from his dyed hair and general disregard for authority. After joining Onizuka’s side, he starts goofing around with him.
Murai’s mother is very young, having him at the age of 13. His father abandoned them both early on and his mom was forced to take care of him herself. He respects her very much and has a distrust towards men (as a result of papa going poof). Others joke this respect borders on a mother-complex.
Their relationship is, from my view, kind of like between an older sister and younger brother, but with motherly undertones too.
As she’s very attractive, Murai fears his mom might attract the wrong kind of guys (like Onizuka).
While he comes off and presents himself as a bit of a punk, he’s ultimately a very sweet boy.