"Toxicâ isnât exactly the word Iâd use either way, but to your point, it depends on what you mean when you say you âkinâ them.
If you mean you identify as them on an integral level, then youâre more or less fine. A lot of otherkin donât like hearing âkinâ used as a verb - myself included; I feel rather strongly that itâs a big contributor to the misuse-of-language problem Iâm about to explain - but you are actually fictionkin, so while I would encourage you to stop using it as a verb both for misinformationâs sake and because it will make a lot of other actual fictionkin avoid you because theyâll think youâre misusing it (again, more on that in a minute), if you really insist on using it as a verb, thatâs your business at that point, Iâm not gonna harass you about it.
If, however, you mean... pretty much anything else, most commonly one of the following:
You relate to them very strongly
You like projecting onto them (and may use it as a coping mechanism)
You stan them/really really like them
You like roleplaying as them/using them as faceclaims (and may use it as a coping mechanism)
Itâs a form of role play (with a space) for you, as explained here
and you donât actually consider yourself to be them on some level, then you are one of the people referred to in the OP as âKFFâ, which is a shorthand for âkin-for-fun peopleâ, and are, probably without realizing, misusing the word âkinâ to mean something itâs not.
Thatâs probably not really your fault, and no shame if you didnât know that up to this point - the âkinning is relating to somethingâ misinformation has spread really far at this point, and for a lot of people itâs unfortunately their first exposure to the term âkinâ. What happened, as far as I can tell, is essentially that people stumbled across light-hearted, jokey posts from otherkin and fictionkin and misinterpreted those posts as being representative of the whole experience, and thus misunderstood what otherkinity and fictionkinity are to begin with.
The problem is that they then started spreading the idea that thatâs what âkinâ means - that itâs a fun fandom thing that just means really relating to something, instead of an actual identity that is integral to how one understands oneself - and now we have a problem where not only is it incredibly difficult for fictionkin in particular to find actual other fictionkin, a lot of people who âkin for funâ outright bully actual otherkin and claim that weâre stealing and misusing the terms we originated over 30 years ago, that if you actually identify as your âkinâ you must be âdelusionalâ, etc. - which, weâve had a problem with antikin for forever, but it... it hits different when it comes from someone whoâs actively taking your terms and trying to shove you out of your own community, especially if you thought they were one of you and that you were in a space that was safe from that, yâfeel?
(If youâre still lost on how this is harming the otherkin community, more on that here, here, and in my âkin for funâ tag, which has a whole bunch of posts both talking about the subject in general and anecdotes from various people recounting their experiences with how the phenomenon of KFF has harmed them personally.)
So... yeah. If you actually do identify as these characters - or if you think you might and arenât sure! no shame in that! - then youâre pretty much in the clear, though personally I would encourage you to quit using âkinâ as a verb. If youâre using it to mean pretty much anything else, I would ask - beg, even - you to please stop doing that and use another word. If none of the words âstan,â ârelate to,â âmood,â and âroleplayâ donât fit perfectly or donât vibe right for you, there are several alternatives that have been coined specifically to replace âkinningâ as a word, which can be found here. (Or coin your own, if none of those vibe right for you! We are all about creating language to describe your experiences where no words exist here - thatâs how the word âotherkinâ came to be in the first place, after all.)