These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Doing It for the Art: Jason Steele was approached by [adult swim] to make a Charlie the Unicorn series. After many attempts, he decided against it seeing that stretching the series into a 30 minute show wouldn't work out.
Drinking Game: Try watching all four of them in a row, taking a drink every time Charlie is named.
Everyone Is Jesus in Purgatory: Charlie indulges in this in the third episode, when he conjectures that he's already dead and the other two unicorns are his eternal punishment. Note that they don't deny this....
Jerkass Woobie: Charlie is rather surly and snarky, but it's difficult to not feel sorry for him with the crap he has to put up with.
He's demoted to just plain woobie in Charlie Teh Unicron, where he's less surly and snarky and more submissive and quiet.