Spacekin

Frau Vanderhoeven waved to me to come over. "Greetings, spacekin!" she said. "We are only just finishing our funeral pyre."

Source: wiktionary

In addition to the otherkin identify as animals, there are some who identify as mythical creatures, like dragons, fairies, or vampires; fictionkin, who identify as fictional characters, frequently from anime series or videogames; weatherkin, like Marco, who identify as weather systems; conceptkin, who identify as abstract concepts; spacekin, who identify as celestial bodies; and several other even more obscure categories (musickin, timeperiodkin—the list goes on).

Source: wiktionary

There's plantkin, spacekin—who's to say planets don't have souls?—and a whole bunch of other Otherkin, It's not just animals.

Source: wiktionary