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Mostly what you see going around now is people using the word kin to mean characters they relate to, imo I wished people picked a different word for it due to it taking away to actual kin lmao

But in terms of spiritual kinning there is multiple things that go into it

You said you already know Fictionkin, otherkin, and Therianthropy but there is many more

There is factkin where someone kins a real person (alive or dead) (This really isn't recognized as a thing in the kin community though)

Divinekin is a term for people who kin things like angels, demons, gods etc

Songkin is mostly used when they believe a song was based on their past life

Copinglink is where people chose kins as a coping mechanism.

You could kin mostly anything actually

(definitions came from these carrds but there is way more that goes into kinning)