One that immediately comes to mind is 'Dungeon Crawler Carl'. It goes way beyond just goblins and skeletons. The monsters are creations of the sadistic showrunners of the galactic reality TV game, so they're designed to be entertaining and humiliating. You get things like a giant worm that vomits up smaller, screaming worm-babies, or a loot bug that's essentially a walking loot piñata you have to beat to death. It's not just about stats; the encounters are weirdly psychological and play with genre tropes in a darkly funny way.
The 'Noobtown' series also deserves a shout. It has a more traditional RPG system, but the author injects a ton of creativity into the monster ecology. There's an entire arc dealing with 'Shart', a demon who is basically a sentient, irritable fart that bonds with the protagonist. How they handle that relationship and the combat applications of a malicious gas cloud is both hilarious and surprisingly tactical. The monsters often have abilities tied directly into the LitRPG mechanics in clever ways that affect resource management and party dynamics beyond simple damage numbers.