Glurp from Mario & Luigi: Superstar Saga and its remake.
I had so much fun doing the Lava Piranha that I figured I should do another Mario RPG sprite. I thought trying another Paper Mario sprite would be limiting, so I took a look at the only other Mario RPG I've beaten and picked out the one that thought would be the easiest to translate [for an easy transition ;)] Glurp it is! Glurps are such cuties and interesting enemies for how far into the game they are, all the while creating a weird sense of danger.
I initially thought Grimer would be the base for this sprite, but it turned out that Ditto had a better shape for what I wanted to do. From the ground up, we have Loudred's mouth, Duskull's eyes, and Combee's antennae. Vaporeon provides an excellent blue for this guy, and Jolteon does the eyes. In a strange twist, the last part done was coloring the inside of the mouth- palette provided by Grimer.