Eldritch Abomination/Web Animation

In The Fear Hole, the horrible thing that Antagonizer fights in Episode 7. It's never seen, but it's described with terms like "It's like a sewer had an abortion", and "It's like if cancer had leprosy" so you know it's bad.
- Plus there's also the thing in Episode 4 who looks like Cthulhu and has the personality of a small, fairly innocent child but in the end turns out to be nasty
Charlie the Unicorn is regularly tricked by two monstrosities into undertaking quests that leave him worse off by the end.
In this cartoon Rittz appears to be tormented by one of these. Don't worry, its funnier than it sounds.
Just about everything animated by Cyriak. He seems oddly fond o f cows...
The TF2 freaks: Painis Cupcake, Dic Soupcan, Vagiscorp and Engina, Snyphurr, Vagineer, Spyder, and Heavydile to name a few.