Helga Pataki: A Quick Theory.
Let me lay something on you, and tell me how it feels:
If you’ve ever watched Hey Arnold you are aware of the regular stash of stock characters the show employs whenever group scenes are needed. They tend to repeat characters, and some of these stock characters have even been supported in their own brief plot-lines. However, one tends to stand out from the rest.
Helga Pataki, one of the main characters, is very rarely not in an episode, and it is also equally rare to see her out of normal, everyday fatigue: a pink dress with a single, wide, solitary salmon/coral pink strip around the base, a white sleeved undershirt, white, nondescript shoes, and her blonde, pig-tailed hair outfitted with a matching pink bow. Since pink is a color that is hardly used in the series, Helga is very easy to spot with a quick, fleeting glance.
That is, unless you have a crowd scene.
She does not have a name, but Doppleganger is a combination character of Sixth grader Connie (face and hair wise) and Helga Pataki (clothing wise). Although there are a score of these type of characters, none have been assigned such a circumstantially iconic color for the basis of their wardrobe. This girl essentially looks like what Helga could be, if she were incredibly vain.
She can represent one of three things:
1) A commentary on the conflicting duality of cartoon women: where a woman can either be stereotypically beautiful and her only purpose is to be admired or she possess an unparalleled personality that completely renders her void of any ounce of attractiveness.
2) this character discovered a split in the space-time continuum and she is Helga from a parallel dimension (this also can be a personificiation of Freud’s theory of the Super-Ego).
3) Helga’s Dad was running around on her mom and had a secret love child. As Big Bob only views Olga as an individual worth his time, he is unable to view his two younger daughters as separate beings. Although he provides for his secret love child, he buys duplicates of everything and divides them up between his younger daughters (hence the same wardrobe). If his love child was older, this might explain why the doppleganger is “better” looking (aka, no eyebrow); her aging has nurtured the development of vanity.
Let us sleep on this and return to it at another time, as I am sure there are plenty of answers out there.