Multiplicity

Also known as Multiple Systems; Related to Otherkin: People who describe themselves as multiple systems (also known as multiples, multiplicity, plurals, alts, and many other names) take the idea of headmates one step further by believing that they actually have multiple people who make up their multiple personalities. So a person who describes themselves as a multiple system will likely refer to themselves as "they" because they believe they are multiple people. When they are acting as the personality of one of their headmates, they call this "fronting". Some multiple systems will have headmates who are animals, otherkin people, and, of course, fictional characters. There are also people who believe they have galaxies, nebulae, universes, and other space shit, either in their "headspace" or as an otherkin. So some people will believe they are actually galaxies.