What is it called if you feel like you are multiple fictional characters and other kins like dragonkin? Is that even possible? I am new to the word ”Otherkin”, sorry if I sound weird. I’ve heard of the word polykin, what does it mean?

I believe that the term is yes, ‘polykin’. “Back in my day” we didn’t have a word for it, you were just fictionkin with multiple ‘sources’.

As for whether its possible or not, that’s up for you to decide. For myself, I believe in multiple univserses and reincarnation theory, so for me, its totally possible that a person was incarnated serially. (Legolas was incarnated as a pikachu, and then as you) or that multiple souls were put into the same body. (Legolas and pikachu both got born as you)