GTO, Kyou kara Ore wa!! Recommendations
Both are likeable, manly, rebellious and funny series of the school-comedy-slice of life genre, and both involve delinquents, students, gangs, fights, rivalry, friendship.
The main characters in GTO are older than the ones in Kyou Kara Ore Wa, but the style and hilarity level are overall the same.
Both series share a delinquent as its protagonist whose misadventures are filled with girls, helping out people and getting into gang fights. If you're looking for enjoyable Shounen manga, then these two are for you.
You will probably enjoy GTO.