Briar

 This is a character my friend Rudy thought of. He calls it Briar.

Here's how he came about.

 There once was an adventurer named Bwaly.

Bwaly

Briar in mid-transformation

 Bwaly was going through the forest when he had the strange feeling that someone was watching him.Turning around, he saw something obscure jump into the shadows.  Being very curious, Bwaly followed it into the darkness. The something was a strange dark goo, and it leaped on Bwaly and crawled over his body, turning him jet black. His arm grew long, sharp talons. He hovered off the ground, dripping black goop that infected whatever it touched. Bwaly forgot everything about himself, his only drive to infect other creatures and turn them into shadow demons.

 If someone can defeat Briar, they could possibly bring back Bwaly.

Anyway, I hope this isn't to much like spider-man 3.
-JohnBob