My wife and I ran through Gravity Falls in the past few weeks. Best animated show since Last Airbender? I think it pulls a similar trick of endearing you to the characters by being hilarious and charming in the monster-of-the-week episodes, and then once you're thoroughly invested, ups the stakes and drops the crazy awesome mytharc eps. I let it play a second time through in the background while working on this, and all the little call-forwards and foreshadowing bits are delicious.
(It also hits a similar vein of what we strived for with Exterminatus Now, straddling paranormal horror themes and goofy comedy turns. The episode "Roadside Attraction" struck a very familiar chord!)
I wanted a fanart piece to tell a bit of story, and to include a creature of existing paranormal folklore that was never mentioned in the show. Oregon might be a bit far north for this beast's usual range, but Soos might know it as... El Chupacabra, dawg!