Re: OOC Discussion
This is the Ninth World, and all things are possible.
Most people are "human", but that varies a lot more than it does nowadays. Having wildly atypical skin colors would not be overly unusual, nor having a differing numbers of fingers or toes. If you get too much beyond human body configuration (i.e. tentacles) you would be considered a mutant, which carries a stigma in some places. Mutant is actually a descriptor you can take, which can come with interesting powers, possible drawbacks, and some rather colorful and different changes to their forms. If you'd like to be a mutant, let me know.
If you're not made of flesh and bone (for the most part), you might be a mutant, AI, plantform, or something of the sort, all of which carry various descriptors. Now some people might have parts of their body replaced by another substance (metal, crystal, hard light, etc.) due to some unusual numenera, but that would not be inherent.
Did you have something specific in mind? :)