[quote=@VATROU]
[@Dedonus] You forgot about Arachne's sizable assets, her Drider Legs of course. I mean what else could I be referring to when I speak of assets. 
[/quote]

[quote=Dedonus]In this case, her lower body is replaced by that of a spider (like a drider - spider-centaur basically - in certain fantasy franchises).[/quote]

Don't make me put you back into the [b]box[/b].

[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]

It might be useful to break down the idea into its fundamental parts.  So for a symbiote-like character, we need to understand that the essence of the idea is that a character has been infected by some sort of parasite.  Parasites come in all sorts of organisms: animals, plants, fungi, bacteria, etc.  You can ask questions like do you want the parasite to coat the victim or remain buried inside while bestowing superhuman powers onto its host?  Also, what sort of relationship do you want the host and parasite to have?  For Venom, for instance, it was almost metaphorically representing the "crazy ex-girlfriend who hasn't moved on yet".  Is the relationship sinister (something that seeks hosts for survival and eventually burns the host out) or mutual (something that helps or benefits the host).

There can also be a variety of origins for this idea. It does not have to have an origin from space.  Maybe it's man-made.  Or something mystical in nature.  Just play around with the idea until you find something that is satisfactory.