I pictured a bog person or the 3,000 yr old Luxor Tomb mummy.
Good question!
When talking about how our "energy" becomes new life after we die, and how that is a semi form of reincarnation, I told my SO that my energy (or some of it, because that is how it works) came from an animal. I connect more easily with animals and I "always" have, and like most INFJs (as well as INTJs and INFPs), I feel "other" amid humans. I like humans, but I don't fit in and I am not understood in most cases. I'm saying this on the forum because it should be relatable for others here. This was also all a hypothetical conversation and I know it isn't that simple.
...So, all this said, I like the idea of living as an animal (not a slug, but maybe a deer, or a tiger, or something). It is likely best for me to continue being a human, though. If we are living "forever" it is important that we be able to communicate what we have learned with others. I could protect animals as a human, too.
What would you choose?