Star Wars: Palpatine. Darth Sidious. What can I say, I'm Sith trash.
Star Trek: Spock (...and McCoy); Data; ? idk in some ways Odo is the obvious answer but ?; the Doctor. and Kes. and B'Elanna.
Discworld: quite possibly Granny Weatherwax, but only by a small margin. For representing a major part of how I'd like to be when I grow up... (also: Esk. Ponder. ...)
Red Dwarf: maybe Holly, though again, not by much. I just don't have the coolness of Lister or the Cat (I realize this is not character-you-are-most-like but sometimes favorites are like that)
Jonathan Strange and Mr. Norrell: practically everyone, but I do feel a little more kinship with Strange than with some of them...
Les Miserables: how am I supposed to choose. this is useless for this purpose. okay, of the amis, Combeferre in that I am him but the story is all about Jean Valjean.
Oz (Baum canon): not a question I have thought about much, but I'd almost say Glinda? Which I'm not sure sounds good to Wicked fans but there are a fairly limited number of recurring characters (and they are like 40% non-human guys with definitive physical characteristics akin to eg the Scarecrow 40% young girls and 15% animals. Well idk maybe that should comprise less than 95%, since there are also several magic users.) But I will also commend Tiktok to droid lovers.
A Series of Unfortunate Events: Violet :) (which really should not be surprising given some aspects of my life)
Doctor Who: a fairly useless answer, but the Doctor himself, in any incarnation but the tenth. (The EMH isn't actually applicable here, though)
POTC: ...I have a weird fondness for Barbossa?
I can barely keep my eyes open at this point and yeah it's ridiculously late for me to be going to sleep so...