By “favorite fictional character” I don’t mean “favorite character of your favorite fiction”, consider the media itself to be irrelevant.
Just consider the character itself and how it changes throughout whichever segments of its timeline, regardless of how the world moves around it (unless it’s relevant);
the show / book / comic / game / political campaign itself may be absolute trash, but you love some character from that more than any other character from anything at all.
Like Magnifico from Wish, or the driver from Big Rigs: Over the Road Racing.
Probably the Doctor of Doctor Who because he’s basically a large handful of characters in one, but with an overarching spirit of curiosity, adventure, and trying to do the right thing
William Hartnell is my favorite
This is my answer too. I think each version of the doctor shines in a fun unique way. My favorite was my first (Christopher eccleston) but they are all wonderful.
“Never be cruel, never be cowardly. Hate is always foolish…and love is always wise. Always try to be nice and never fail to be kind”