Rules of the meme:
Pick any four of the following categories. List one (or more) of your favorite fictional characters in each category, tell what book/movie/etc. the character is from, and explain what makes that character special for you.
Pirate, Ninja, Robot, Monkey,
Doctor, Soldier, Witch, Detective,
Wizard, Ghost, Monster, Spy,
Scientist, Alien, Swashbuckler, Pet,
or add your own category
Long John Silver, from Treasure Island by Robert Louis Stevenson. He is the quintessential fictional pirate in my mind. There are others who are truer to what real life pirates were like, but whenever someone mentions "pirate," Long John is still the first thought in my head. (Followed closely by Captain Scratch from Ghost in the Noonday Sun, by Sid Fleischman.)
Frau Totenkopf, from Fables by Bill Willingham. Better known as the witch from Hansel & Gretel, she's so much cooler than a classical witch has any right to be--and thanks to the concept of "The enemy of my enemy is my friend," she works for the good guys now. Calm, collected, ultra-competent, and somehow manages to save the day while keeping up her knitting. If you aren't reading Fables, you should; it's one of the best comic books out there.
(Runner up: Faintly Macabre, the "Wicked Which," from The Phantom Tollbooth by Norman Juster. Picked primarily because I just finished re-reading the book (as you all should), and therefore that's fresh in my mind. And she has one of the best names for a witch.)
The flesh-eating beetles from the Brendan Fraser remake of The Mummy. I was going to go with the Mummy himself, but I kept thinking about those beetles. One of the recent crop of Discovery Channel station identification ads gives me the creeps as a result of these critters. -shudder-
Doc Brown, from Back to the Future. "The way I see it, if you're gonna build a time machine into a car, why not do it with some style?" 'Nuff said.
Feudalism: Serf & Turf