So I am working on a campaign idea I had. The basic premise is that the PCs are part of an Expeditionary force for a nation sent to a mysterious large island which largely is shrouded in mystery. The island is home of was home to an advanced civilization that underwent a collapse, so all that remains is sparse and scattered communities of survivors, as well as other things.
The Civilization as far as technology levels is past our own, fusion energy, holographic technology, artificial intelligences, gene manipulation, etc. The PC's would be only used to technology from the Renaissance. So black powder firearms would be uncommon.
The point of this thread is I am trying to gather ideas for the denizens of this shattered civilization. Largely it will be a jungle environment, that has overgrown the city centers. I plan on having tribes of mutants who will be largely hostile, but also wanted mutants who might be friendly to the party.
So I am trying to think of races that might have already been made that would fit these roles, that I might re-flavor. That or make new races that work. I kind of leading for things leaning on undead, lycanthropes(animorphic), plant, etc.
I also am going to have Android, and other robots, but want to have things like robotic animals, large flying drones, etc.
If people could point me to ideas, or sources. Even make their own suggestions. I myself am going to be adding my own ideas here for people to look over and comment on. Any help would be great.