The Heap otherwise known as Eddie Beckett Is literally made out of necroplasim and garbage. His powers aremostly unknown, however he has the ability to regrow himself from objects surrounding him.

Eddie was once a regular bum, living on the streets.
He was brutally stabbed in the stomach and died.
He was resurrected from Spawns necroplasim blood
that was lying next to him in the ally. It bonded with
him and the garbage around him to become one being.

   Eddie was then revealed to be a messenger
sent from The Greenworld to kidnap Al
Simmons. The Heap hasn't been seen ever since.