Hydra

A multi-headed hydra doesn't really have a distinct biology, so I went with an easy-to design amorphous blob body to the point of nearly being Lovecraftian. Having all the heads be identical is visually boring to me, so I made each head a pop culture reference. Except the top two heads which I used to attempt to illustrate the hydra nature of growing two heads out of a cut off stump.
I'm amused by the thought of the heads bickering with each other, and I'd imagine Ghidorah is the most antagonizing of them all.