Even "Plank" grew up in Isaiah Stephens' fan-art where all the idiotic characters from the classic show Ed, Edd n Eddy are now adults.
They might look totally normal at first, but just look into Ed's eye in the first pic below and you'll see madness.
Here are some individual comparisons from Isaiah's Tumblr:
The Eds, Jimmy, Jonny, Rolf and Kevin:
And the ladies of Ed, Edd n Eddy: The Kanker Sisters, Sarah and Nazz:
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