So...for a bit of context, this relates to an idea of mine: South Park: Universes Coll-Ed. It's more or less a parody of Stick of Truth and Fractured But Whole, built like a playable South Park/Ed, Edd n' Eddy crossover fanfic.

Oh, and yes, the characters take on South Park's style upon entering the show. It's like Channel Chasers, where each time they enter a different cartoon, they morph to blend in with that cartoon's style. Designs based on this: https://www.youtube.com/watch?v=SkQnnIcNxr8

The cast have their own superhero alter-egos, much like the boys' in Fractured But Whole. Here's Double D as his: "Neuromaster", a pacifistic hero with super intelligence, who'd rather sort issues out through analysis and rationality than through battle ("Laaaame!", Eddy says).

Part of this pic comes from Double D's established open hatred for South Park. He can't see it as anything other than "immature tripe made by talentless hacks to pander to the lowest common denominator", and it certainly doesn't help that the other two Eds force him to watch it. He's forced to tag along on this mission, albeit, he grows to genuinely care about it after meeting New Kid. At any rate, a cowardly, wimpy guy like him obviously doesn't want to be part of a cartoon where he could be wiped out like a certain orange parka-wearing kid at any time.

The whole "diaper" bit isn't canon. No explicit ABDL themes in this crossover; it's for a- relatively- general audience. However, given that South Park has had instances of characters crapping their pants, and I've drawn Double D as an ABDL before...well, I had to draw this.

So, yeah. Have AB Double D as Neuromaster lying out of his freakin' ass.

South Park belongs to Comedy Central and Paramount

Ed, Edd n' Eddy belongs to AKA Cartoon Studios