So, I feel bad trying to pimp out Booster Gold, because invariably he's involved in some enormous, ridiculous event that non-comic people and comic people alike shun and avoid. But he himself isn't complicated to understand! And that, my friends, is why I love Justice League Unlimited. They gave us an episode about Booster that does a really good job of showing his personality. They don't go into his tortured backstory or what have you. It's self-contained and you only need a tertiary knowledge of superheroes or DC to understand it. So! I demand you watch it. And ask me for more canon so you can App Skeets.
The Greatest Story Never Told - On tv-links it's under "The Return" which is just plumb wrong. Anyway! Watch it! Love it!