Bee and Puppycat! The original pilot webseries starts off as a bit of a fever dream with a lot of stuff just... happening. I still found it enjoyable as a spectacle, but over time the show started to pull on some plot threads and start tying things into longer running arcs. It also had some absolutely lovely and somber parts in the later episodes. The Netflix series did even better, reworking the story a bit to establish characters earlier and more deeply and planting seeds for deeper intrigue. The type of humor may not be for everyone, but it's ended up being one of my favorite shows.

Also, Summer Camp Island. Starts off with some pretty charming but generic episodes, but it really started to dig into that Julia Pot weirdness from the second season onward. They also started doing some longer 3-episode arcs that explored character backstories much more deeply.