I'm going to answer this question as honestly as I can, from both a personal and factual standpoint.
As far as personal experience goes, I'm what's called a " fictionkin " myself. That is, I identify as a character from fiction. In my case, specifically, I identify as a character from the Harry Potter series. For me, this isn't just a phase or something I do for fun - it's a very real and meaningful part of my life. So from a personal standpoint, I absolutely believe that fictionkin are real.
Now, from a more factual standpoint, the answer is a little more complicated. Obviously, we can't know for certain whether or not fictionkin are " real " in the sense that we can know, for example, that humans are real. However, there is some evidence to suggest that fictionkin may indeed be real.
For example, a study published in the journal Frontiers in Psychology found that people who identify as fictionkin are more likely than those who don't to suffer from mental health conditions such as depression and anxiety. This suggests that there may be something more going on with fictionkin than simply a shared love of fictional characters.
Another study, published in the journal PLOS ONE, found that fictionkin were more likely than non-fictionkin to report a history of trauma, and that they were more likely to use escapist coping mechanisms such as dissociation. This again suggests that there may be something more going on with fictionkin than simply a shared love of fictional characters.
So, to answer the question, " Is fictionkin real? ", I would say that the evidence suggests that it may well be. However, as with anything, it's ultimately up to each individual to decide for themselves whether or not they believe fictionkin are real.