Jewelpet Sunshine

They have funny episodes and both take place at the school's benches. If you like parodies, you will enjoy it. 

Both have similar shojo/comedy style with charismatic characters and a bit of drammatic moments. 

Both shows have a primarily female cast and a high school setting. However, Jewelpet Sunshine has much more exciting and magical adventures than One does. 

Both involve going to school to study magic. 

Both are enough similar about random comedy style, in some episodes, these, ends up in the same way and also have some references from pop japanese cultures, manga, anime and movies. In a few words, despite gintama and sunshine have different demographic, these series have some features in common. 

Paniponi is about class members that solve hilarious problems with random episodes. Same thing goes for Jewelpet sunshine 

Another show based on a Sanrio property. 

School Rumble and JewelPet Sunshine are both very hilarious, these are also very similar in term of anime's school theme 

Similar class members, similar humor style and also have the school as main place. 

Both have same character designer and both are very hilarious. The human characters from sunshine have evolved to a galaxy angel style. 

Class members VERY similar. Humor similar. Madness similar.