I forgot about it until tonight, when I ended up on Qubo playing "Spliced" again. This time they had a character called Oct-O-Cat, which again prompted me to think of a character I'd drawn years ago. I finally remembered a "character design community" I joined in 2006 called "Mojizu". I was into that site for a hot minute, then got lazy/busy/bored and stopped posting after a brief burst. Luckily, my drawings are still preserved there with date-stamps and everything.
My Oct O Cat character on the left, Scene from "Spliced" on the right:
For the record, Wikipedia says Spliced first aired in 2009. If you click on my drawings above, it'll link to the original post with comments from 2006. I'm not implying there are any shenanigans going on, but it's a weird coincidence, no?