Nounself pronouns are a type of neopronouns that are clearly derived from a pre-existing word, to be used as a gender neutral pronoun set. Any word can be turned into a pronoun set, so this allows there to be theoretically infinite sets of nounself pronouns. The word in question does not have to be a noun. These sets can be themed around concepts that have nothing to do with gender, such as animals, technology, or abstract concepts.
Unlike other neopronouns, these sets are usually intended to be used by a small number of people who feel that these pronouns express something distinctive about themselves and/or about their gender. In these ways they are similar to xenogenders, however, not all people who use nounself pronouns are xenic. Anyone can use nounself pronouns regardless of their gender or expression.
Starting in early 2014, or late 2013, a community of non-binary people on Tumblr came up with the idea of "nounself pronouns". Some of the earliest sets of nounself pronouns are the fairy themed set fae/faer, and the bunny themed set bun/buns. As of today the fae set is the most popular nounself pronoun set, with the bun set coming second.