Check out this character descripton by ‘Simple Man’ on RPG.net. It began with him and a friend invite to a game of D&D, which wasn’t their first choice. But, they were determined to find a hook they could get into. And so…
3 seconds later, my friend hit me with a statement that I should have known all along: “Dude, we’re the boondock saints!” And from then on, our characters were brothers by blood.
And so Wolfgang and Albrecht were born, a Paladin and Cleric (respectively) who drank heavily (often toasting Pelor), roughhoused in the tavern, and basically partook of anything seedy but still considered acceptible by D&D standards of Law and Good. If there was Evil, we smote it. If there was an innocent in danger, we would quickly sober up and save the day.
But we played brothers first and foremost. We played darts in the bar, then beat eachother up when one started to get ahead. If one ran headlong into danger, the other followed. And if one was insulted by a townsperson, the other decked said townsperson. We also tried to get the rest of the party in on it, as we were roleplaying becoming fast friends with everyone, lovable drunkards who were really decent fellows down at the core.
Awesome. Even when the focus is on tactics and challenge, a good D&D game absolutely needs vibrant character hooks you can riff off of.