Oh, I forgot about Gintama. For me, I watched the anime. Haven't touched the manga.
Speaking of Gintama, here's Sket Dance. It's like Gintama but set in a school.
Sket Dance tells a daily life story of a High School supportive club called Sket Dan (Support Kindness Encouragement Troubleshoot). With a boy called Fujisaki (Bossun) as the leader, Onizuka (Himeko) as the club's muscle, and Usui (Switch) as the club's secretary. The trio band together as one to solve people's problems such as bullies and any life problems they have through a request. As many requests come, will the three be able to solve them all?