GTO, Yankee-kun to Megane-chan Recommendations
A male delinquent takes on a leadership roll and becomes responsible for the well being of his class and his school. Tho he means well people still see him as a delinquent and try to get in his way... lifes not so simple even when you dont fallow the rules
Both share Delinquency as a theme for the main characters, the difference being in Onizuka the main delinquent is the teacher and in Yankee-kun its the student.
Both have a fair amount of fighting and exaggeration, Onizuka is more mindless fun whereas Yankee is more developed in terms of relationships.