What series is this depiction of Araragi Karen referring to?


In episode 8 of Nisemonogatari, we briefly see Araragi Karen drawn like this:

![enter image description here](https://i.stack.imgur.com/EJ0ehm.png)

This looked a lot like some anime (or possibly a character from an anime or
manga) I'd seen within the last ten years or so while in Asia, so I have the
feeling this drawing style was supposed to allude to something. (Possibly [Dr.
Slump](http://en.wikipedia.org/wiki/Dr._Slump)? I'm not sure since I don't
think I ever saw the anime, and I could easily have mixed it up with something
else.)

That said, this also looks "generic" enough that's possible that this is only
a shift in drawing style. But then right before this image, there's a drawing
of Karen that looked like (to me anyway: I have a feeling I'm wrong about
this) an imitation of the titular character of [Chibi Maruko-
chan](http://en.wikipedia.org/wiki/Chibi_Maruko-chan), so I'm not sure:

![enter image description here](https://i.stack.imgur.com/yI3Izm.png)

Moreover, I remember seeing something that looked very much like a parody of
[Peko-chan](http://en.wikipedia.org/wiki/Fujiya_Co.) in an earlier episode,
though unfortunately I don't remember which one it was:

![enter image description here](https://i.stack.imgur.com/Vj0sIm.png)

Is this (the first image, I mean) supposed to be an allusion to some other
anime series, and if so, what is it referring to?




Many of the slapstick moments in the Monogatari Series are depicted in a way
that closely resembles the art style of
[Doraemon](http://www.anisearch.com/anime/1840,doraemon). In fact, I vaguely
remember a scene where the protagonist of the Monogatari Series, [Koyomi
Araragi](http://www.anisearch.com/character/5174,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](http://www.anisearch.com/anime/540,doraemon-1979) which sports a
whopping 1787 episodes.

