Characters:
Obvious guy: someone who points out the obvious so audiences who don't get it can keep up.
Honest guy: someone who points out what everyone is really thinking even if its culturally inappropriate to do so
Smart guy: someone who can do stuff ordinary people can't so you can advance the plot faster; ie hack a computer
funny guy: someone to lighten the tension when things get too intense
token minority: someone to even out the racial demographic to keep the NAACP off your butt
Narator/Journal guy: someone in the story that is documenting either by journal,blog,book,etc the cool stuff your hero is doing.
Love interest: Girl who everyone wants the hero to hook up with but can't
Love interest foil: Person who is keeping the hero from hooking up with his dream girl
Antagonist: someone that is far smarter than our hero and will do evil stuff that our hero must thwart
Antagonist foil: someone that the evil genius trusts that keeps each scheme from getting too evil.
plucky sidekick: a protege who keeps the hero grounded to his roots
expendable flunkies: characters who can be easily dispatched and replaced at random intervals.
Emotionally relevant dead character: Someone to serve as a plot catalyst to justify abnormal hero/villian behavior.
Mentor: someone who taught the hero/villian how to do stuff no one else can.
Eye Candy: Random good looking people that pop up to catch channel surfers' attention.
Gay/Lesbian: Someone who started the show straight but comes to their senses because of some life lesson learned while fighting evil
Innocent Best friend: someone outside the secret society that our hero must tell everything to without actually telling them anything.
Neutral guy: somone who does both good and bad stuff with very reasonable reasons why which frustrates the hero
sudden Betrayal guy: sonmeone who is unexpectadly working for the other side just when we think the story is over.
Innocent betrayal guy: someone who is forced to wrok for the other side because of some unforseen circumstances
obscure expert: someone who we think is just some homeless/janitor guy who is actually an expert/genius in something useful
boundary catalyst: a force/entity/code/character that keeps the hero/villian from going over to the other side.
Random young person: someone who will cause a lot of trouble for no logical reason which can be easily dismissed as youthfull naivete.
Mysterious informant: someone who knows everything but refuses to tell us how or why they are willing to tell the hero only small bits of information
Sage: retired version of hero/villian trusted to expout wisdom at the end of each story to their now active protege
Nosy reporter: someone who is trying to expose the hero, but does it for the good of society
Evil reporter: someone who is trying to destroy the hero, but does it for selfish reasons
Hero: the guy in the front of the poster.
Did I miss anything?