[quote=@Chaotic Chao]
[@Dedonus] I was thinking of a character based off Black Suit Spider-Man, or better yet the Toxin symbiote but not as powerful as it.

But I can't think of an origin for why a sort-of symbiote like creature would find and want to co-exist with a human being, nor can I think of a satisfying origin.
[/quote]

Maybe it doesn't but can't exist without a host? This might create an interesting inner conflict?

Racheli's virus is alive and intelligent, having come on a space rock to earth.