1. The underdog. (Most of the fairytales have good examples of these. Cinderella is not expected to do well by her stepmother and stepsisters!).
2. The character who is not expected to be a hero but becomes one. (Frodo Baggins is a great example).
3. The rebel (especially one who can see through the faults of their own side and has tried to rectify them but to no avail. My fairy godmother character, Eileen, is of this ilk. Characters like that are great fun to write for).
4. A well rounded animal character. I have a soft spot for anthropomorphism. Where would The Wind in the Willows be without it?! I also adore Gaspode in Terry Pratchett's Discworld.
5. Those who deal out justice to those worthy of receiving it! This is usually where some character thinks they've got away with something and our hero/heroine turns up to prove them wrong. Or it can be someone like Terry Pratchett's Lord Vetinari who deals out what he feels is appropriate justice (and is usually right. Look at how he deals with Moist Von Lipvig in Going Postal).