Gintama

Life isn't easy in feudal Japan... especially since the aliens landed and conquered everything! Oh sure, the new health care is great, but the public ban on the use of swords has left a lot of defeated samurai with a difficult decision to make concerning their future career paths! This is especially true if, as in the case of Gintoki Sakata, they're not particularly inclined towards holding a day job, which is why Gintoki's opted for the freelance route, taking any job that's offered to him as long as the financial remuneration sounds right. Unfortunately, in a brave new world filled with stray bug-eyed monsters, upwardly mobile Yakuza and overly ambitious E.T. entrepreneurs, those jobs usually don't pay as well as they should for the pain, suffering and indignities endured! (Source: Sentai Filmworks)

Kyou kara Ore wa!!

This anime is about two students who are tired of being normal and unpopular at their old schools, after they both transfer to a new one they try to change that by deciding to become delinquents. After a rough start they become friends and the righteous Itou with the cheater Takashi start their (dis)adventures trying to survive the other delinquents from both their own and other schools.

Be-Bop High School

For the invincible and basically happy punk lads Hiroshi and Toru, what they care about every day is to get a lot of attention from girls and to win the fights against the lads from other schools. Whenever provoked, they just go out fighting and settle the situation no matter what it costs. (Source: AniDB)