Looking for the Shino (Japanese) equivalent of nymphs and natures spirits, I found Kami.
they can also be the spirits of venerated dead persons. Many kami are considered the ancient ancestors of entire clans (some ancestors became kami upon their death if they were able to embody the values and virtues of kami in life)
This says in order for a human to become a Kami, they must have had the virtues and values of a kami. But in the next paragraph...
In Shinto, kami are not separate from nature, but are of nature, possessing positive and negative, and good and evil characteristics.
... it says kami can be good and evil. So, how are the virtues measured? If you can be either good or evil, does that mean everyone can become a kami?