poly-fictionkin anon here! I mainly see two types, people who identify as two characters in the same canon. (As in the same person being both Shinji Ikari AND Kaworu Nagisa from NGE) And, I also see people being kin with multiple characters from different canons. (So one person being, Shinji Ikari, Steven Universe, and Miku Hatsune). What are your opinions on those two types?
My basic opinion is that every identity someone has should be given equal weight and scrutiny by both themselves, and others. I believe each identity comes with its own awakening, and emotional baggage, and should be given time, and meditated on completely, until one is sure. I get annoyed at people who have a new kintype every week, or add identities to their list like picking chocolates at a candy shop.
That said, I absolutely believe that poly-fictionkin, both types as described here, are real, and valid. In the first instance, identifying as two people from the same canon, I imagine that either two souls were born (or however you understand fictionkin to come into an earth body) into the same body, for whatever reason. Possibly because they were emotionally inseparable.
In the second case, which is my case, I imagine it as serial incarnation. In otherwards, Shinji Ikari was born as Stephen Universe, and Steven Universe was born as Miku Hatsune, and Miku Hanstune was born as Fred who works at McDonalds.
