Gintama, Baka to Test to Shoukanjuu Recommendations
Well, gintama is random and parody on several animes and Baka test is random and a parody on several animes too and they are both funny, (in other ways though)! Gintama is sometimes a bit more serious than this one, but that's the only difference. I recommend both of them!
Great characters, good use of parody for comedic effect
Same nonsense comedy! Hilarious!