Gintama.: Porori-hen

Gintama's "Porori-hen/Slip arc" can be compared and give off similarities to Koyomimonogatari as in both of these can be viewed as more "filler-like" compared to the actual series (Gintama/Monogatari) and feel more like nice little side stories that aren't a necessity. (The last 2 episodes of Koyomi are recommended though) A fairly large amount of the cast from previous seasons are shown which can increase enjoyment if you are a fan of the series.  

Both anime have a similar humor style and mix of action and comedy, as well as a protagonist who is incredibly overpowered.  

Both anime have a blend of humor and action, as well as a unique premise 

Both Sket Dance and Gintama share a similar sense of humor and a mix of genres, with action, comedy, and drama.  

Both anime have an action-comedy genre and feature supernatural elements.