What kind of creature is the marvel character venom?

Answer 1

There are various different origin stories for Venom, from the movie story which is similar to the classic Venom story, to the Ultimate Spider-Man Venom. In all of them Venom is a symbiotic organism that briefly merges with Spider-Man before being cast off by Peter Parker (aka Spider-Man) after he realised the negative effects of the symbiotic on his mental and social state.

It then forms a symbiotic bond with Eddie Brock. This combination of Brock and the symbiotic is what most people think of as the Venom character.

In the version most people favour, Brock is a journalist who identifies a serial killer only for Spider-Man to catch the real killer. Disgraced he is filled with rage when he is exposed to the rejected symbiotic and it bonds with him based on this hatred for Spider-Man.

Having been bonded with Spiderman, the symbiot imbued Brock with super human powers copied and improved upon from Spiderman as well as the knowledge that Peter Parker is Spiderman.

In this version and most others, the venom symbiotic is an alien organism that bonds with a host to live while making improving their abilities with its own and those it has taken from other hosts while slowly destroying the host's mind with rage.

The Brock Venom character I have discussed briefly here goes on to semi reform, becoming an anti hero who is as often found aiding heroes as fighting them but only after many, many stories as a pure villain.