Kin

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Kin, short for otherkin and fictionkin, also called "'kin" are people who identify as partially or entirely nonhuman or an entity from fiction. This identity is often involuntary.

Kintypes are not specific to plurality, as singlets can also be kin. However, there are some similarities between being kin and plurality, and system members can identify as both.

There are also similar related groups, such as therians or otherhearted.

History
Modern otherkin grew out of the 70s with The Elf Queen's Daughters, which are a group of people who identified as elves, then called elfinkind. The community picked up in the 90s with mailing lists and eventually the term "otherkind" was coined to refer to people who identified as species other than elves or dragons. It is unknown when it was shortened to "otherkin".

Ficionkin came from a subgroup of otherkin known as "otakukin" in the early 2000s. The term was changed to "mediakin" and later to "fictionkin".

Much of otherkin culture also has overlap with the therian community, who identify as animals and share similar nonhuman identities, though are independent groups. The use of kintype and shifting terminology came from the therian community.

Otherkin has had a lot of overlap with plural communities. Early fictive and fictionkin groups often involved the two together, and some early plural terminology lists used otherkin to refer to nonhuman system members. Many 'kin groups are still accepting of plurals.

Related Terms
A system that is composed primarily of kintypes can be described as a kin system.

A kinform is a kin that became a headmate.

Kins are not the same as fictives or extranths, but both do consider themselves to be nonhuman or fictional to some extent People in a system can be kin and identify as kin for being fictive/extranth, but that does not mean being kin is inherently same as being an introject.