 If you liked
GTO
|
 ...then you might like
Aiki
|
Both GTO and AIKI have a teacher who is evil, crazy and perverse.
even the general feel of both mangas are the same.
In GTO they just fight alot not any real martial arts skills like in Aiki that's solely focused on martial arts. They are also both teachers although the protagonist in GTO is a teacher for high school students while in Aiki the protagonist is a teacher for university students.
Both are also fighting a lot and they won't take an insult from anyone. They also have zero respect for others that are mean or being assholes. (Although they can be those assholes sometimes.)