I once tried to create a superhero character whose entire body and brain had been replaced by an alien-grown living prosthetic. I was never happy with the character, but the artificial organism was interesting.
In many ways it's similar to what Sirocco called the Gook - a protoplasmic mass that can reshape itself made up of a colony of small creatures (inspired, in my case, by reading about slime moulds). My version could resproduce organ structures and a physical form, and was specifically engineered to act as replacement parts by an alien race. They can support a psychic "imprint" - a recording of a sentient creature's mind - and act as a host body, and have a number of pre-programmed "organ blueprints" which they can shift into - this was going to allow my nameless superhero to (e.g.) sharpen his senses, give himself infra-red vision, boost his muscle mass and change his face at will. Not really the sort of thing that would naturally evolve, but a psychic race with better biotech than cybernetics might conceivably come up with something like it.
The organism could also break off lumps of itself that could move around independantly, although they reverted back to a low intelligence once they couldn't sustain large enough central nervous system and/or telepathic organs. It would also keep growing slowly, so my character would end up with a tank of spare protoplasmic mass, which he could use for replacements when he began to lose mass (which was about the only way he could be permanently killed).
Unfortunately none of this vaguely-conceivable biology really fitted in with the standard superheroic setting, and I never could get a superhero name that worked.
In many ways it's similar to what Sirocco called the Gook - a protoplasmic mass that can reshape itself made up of a colony of small creatures (inspired, in my case, by reading about slime moulds). My version could resproduce organ structures and a physical form, and was specifically engineered to act as replacement parts by an alien race. They can support a psychic "imprint" - a recording of a sentient creature's mind - and act as a host body, and have a number of pre-programmed "organ blueprints" which they can shift into - this was going to allow my nameless superhero to (e.g.) sharpen his senses, give himself infra-red vision, boost his muscle mass and change his face at will. Not really the sort of thing that would naturally evolve, but a psychic race with better biotech than cybernetics might conceivably come up with something like it.
The organism could also break off lumps of itself that could move around independantly, although they reverted back to a low intelligence once they couldn't sustain large enough central nervous system and/or telepathic organs. It would also keep growing slowly, so my character would end up with a tank of spare protoplasmic mass, which he could use for replacements when he began to lose mass (which was about the only way he could be permanently killed).
Unfortunately none of this vaguely-conceivable biology really fitted in with the standard superheroic setting, and I never could get a superhero name that worked.