Fictionkins :: people who involuntarily identify as a fictional character, often on a non-physical level [in my case, it's generally seen physically, which is so-called ❛❛IRL❜❜]. So no, it isn't a choice. However, fictionkins and kinnies aren't the same thing. Kinnie is a label for those who just heavily relate to a character.

Fictives :: alters, in systems, based on fictional characters [also known as "introjects"].

Fableings :: people who both kin/identify and have an alter based-off a fictional character.

Systems :: often caused by traumas, where the person is generally affected by DID [dissociative identity disorder] or OSDD [other specified dissociative disorders], and have the presence of two or more headmates/alters in their single body. [my meaning of systems might be hard to understand, so you can check out a trusted site to look for a better one!]

Links :: a non-human being/persona [animal species, fictional characters, invented/mythical creatures] that someone chooses to identify as, it can be any motive [two examples below].

✦ Funlinks/F'links :: people who choose to create/identify as a non-human being/persona, for example, animals/fictional characters/mythical creatures for fun.

✦ Copinglinks/C'links :: people who choose to create/identify as a non-human being/persona, for example, animals/fictional characters/mythical creatures as a coping mechanism.

Yumeshipping :: the idea of shipping yourself with a fictional character, being hyperfixed to them, considering them your partner/wife.husband ect.. You may encounter the terms of "𝘯𝘰𝘯-𝘴𝘩𝘢𝘳𝘪𝘯𝘨" and "𝘴𝘦𝘭𝘦𝘤𝘵𝘪𝘷𝘦" yumeshippers, which is their degree of sharing of their yume/character.

Doubles :: in the context of fictionkins, are some people who has the same kintype as you. In the context of yumeshipping, it's someone who has the same yume as you. It is normally a term for fictives, it's used contreversially.

Selfcest :: the term of selfcest is used to express a ship of different versions of a character. In my case, I use this term because it happens that I ship my kintypes together, which makes it pretty much like selfcest in my opinion.

✮ Kintypes :: the fictional character you identify as.

✮ Alters :: an alter is an identity within several in the body of someone affected with DID/OSDD.