Doug is probably the only one who doesn't look like an alien from an episode of Justice League in Isaiah Stephen's fan-art, with all the characters from the classic Nickelodeon cartoon as grown ups.
That's Connie, Chalky, Beebe, Judy, Patty, Doug, Skeeter, Roger, Ned, Boomer and Willie in the top photo.
And here are some comparisons if you forgot how they look:
All Grown Up: Doug [DeviantART, Tumblr]
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