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.
Hands down, Ron Swanson from Parks & Recreation.
He’s a libertarian who firmly believes in his right to self-determination, but doesn’t force that view on those around him; he lets them live their own lives and is there to help them whenever they may need. I do somewhat envy his ability to ignore the meaningless bullshit around modern life, how he paddles his own canoe and strives not to be in anyone’s way.
But most importantly, he’s fond of pretty, dark haired women, and breakfast food, and who can argue with that?