Meme discusses characters and characterization a lot. Here are some resources, plus various FFA threads on the topic (note: not even close to a complete list of the latter).

Outside threads

• Real people vs. characters
• Victoria Lynn Schmidt: Your Character's Journey
• Fuck Yeah Character Development
• The 100 Most Important Things To Know About Your Character (revised)
• Creating Proactive vs. Reactive Characters
• "Interiority" for character writing
• The Unreliable Narrator
• Create Emotion, Not Sentimentality, in Fiction
• Finding Unusual Ways to Describe Emotions
• The Emotion Thesaurus
• Body Language
• Characterization and Body Language
• Understanding Body Language
• Examining the Mob Mentality
• Character motivation

FFA Threads

• why does everyone suck at writing drunk!characters? (Jan. 14, 2012)
• how many pov characters are too many? (Jan. 17, 2012)
• The "Oh, it's you" writing thread — “how do you handle a situation where there's a character who logically makes sense to be included because of canon relationships but is a poor fit for this particular fic?” (Jan. 22, 2012)
• Writing characters moving from traditional into poly subcultures
• Writing religious characters for non-religious authors
• "What's your favourite doll/avatar maker to create your OCs on?"

• Coming up with (government agency) job for OC
• Character Development
• OCs