Let's try something difficult now that Season 15A is over and the series may be ending this year: I want to compile a top-five list of each important character's best moments. Basically, if you think a character may have five good moments in the series, that's important enough for this list! That's a whole lot of characters to cover, so this should be fun.
I'll do my best to help organize and define each moment for each character, plus label its episode...but the easier and more specific you can make this for me, the better. For example, I may follow you if you say "That time when Cartman yelled at his mom in that iPad-episode"...but I'll better understand you if you say "Cartman accusing Mrs. Cartman of f***ing him through-out 'HUMANCENTiPAD.'" That example would cover the majority of an episode, though there may be other cases you choose to get more specific like "Randy on the Wheel of Fortune in 'With Apologies to Jesse Jackson.'" Answer however you feel is fitting, and we'll advance from there.
Now, as for how to best collect and rank these moments...let's start by collecting as many great moments as we can. You're welcome to name an unlimited amount of moments per character as you, for as many characters as you wish. I'll organize them in the meanwhile; when this topic serves its purpose to encompass most of these great moments, I'll make more specific topics on each character to decide their best moments.
So, are you in...because I can't do this without you! Got questions? Ask them, because it's a pretty loose idea right now that will need your input to develop.
EDIT:
For South Park Studio's list of episodes: http://www.southparkstudios.com/guide/episodes/
For South Park Studio's list of characters: http://www.southparkstudios.com/guide/characters/
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Nominate E P O N A.