Okay, as I've thought about it, I've realized that the species that I've been "creating" as OCs might actually be like. My species. Which makes a lot of sense because there have been times when I made a guess about the biology of this species and how they might work, which is somehow backed up by real science despite the fact that I am not a biologist or anything close (yet). Which I think means that these things were common knowledge to my species, similar to how humans learn in school about their own biology. So yeah! That's fun.
I still don't know what the planet I'm from looks like, completely, or how it works, which sucks. But I have some knowledge about the biology of my species and some cultural stuff which is amazing.
Based on both my "memories" of stuff and assumptions I've made based on my own experiences and behaviors here is some stuff I am pretty sure about concerning my species:
We're shapeshifters! Our shapeshifting is facilitated by the structure of our bodies; we're composed of a multitude of smaller creatures that can function independently. They form membranes around themselves for protection, which can have many different properties. Because of the ability of the creatures to function on their own, and the membranes they can split and reform into different shapes.
Because of our ability to shapeshift, having multiple separate identities is pretty much the default. Members of our species would cycle through lots of different personalities and even names over their lives, and would sometimes use multiple names or identities at a time.
I'm pretty sure we get energy through something like photosynthesis
Being low or no empathy/sympathy and being anattractional (by human standards) is the default.
Oh and we don't have faces (not sure how we see but I think we do)