I believe that having a headcanon of your favorite character is totally fine. Its a nice contributor to making fanart and fanfiction. However, what I do not like is when a headcanon gets taken too far, contradicts the characters backstory and personality too much,is problematic or is treated as actual canon.
What are your feels?
Edit: I am making a series of posts based on discussing my opinions on certain things. I’m calling it “My Thoughts”.
Doggonnys
If it’s problematic then that’s really bad and being treated like canon is weird but besides that I don’t really care since I have a couple headcanons and I know people that have contradictory ones