What series is this depiction of Araragi Karen referring to?
Many of the slapstick moments in the Monogatari Series are depicted in a way that closely resembles the art style of Doraemon. In fact, I vaguely remember a scene where the protagonist of the Monogatari Series, Koyomi Araragi, complains about too many Doraemon references.

The whole Doraemon series is very extensive with a myriad of movies and specials and not to mention the second season which sports a whopping 1787 episodes.