I'm wildly varied in my characters and their characterization ... I try to make them all enjoyable for everybody, though.
Probably mostly that they're all wise-acres ... as am I, of course, so I guess that's how my personality always flows into my characters.
One of my favorites was a Dwarven Bard ... I took Perform (Storytelling) and tried to "get into it" by telling old anecdotal tales appropriate to the moment. "Ahhhh, so there I was, fifteen Lizardfolk with murder in their glassy eyes, and me with naught but me skivvies and a carp named Mervyn to protect me ..." Everybody would ask: "Is this ... a particularly INSPIRING tale?" because I just started blathering on whether I was activating an ability or not. Great fun, but hard to come up with an appropriate story for every eventuality.
Currently the GM we're playing with has a very interesting campaign backstory involving an evil empire and the enslavement of mankind. He opened up alot of non-standard races, with Drow playing a reasonably important part in the Empire. The intent was that everybody would play a "Freedom Fighter" of some sort ... good Elves, underground humans, gnomes, halflings, etc. Fighting for the downfall of the Empire and all that rot.
So I decided to play a Drow, to fit in with the campaign. But not a goody Dribble Do'Udon Drow, an evil-to-the-core rat bastard of the highest order. It's been a blast. I was very very careful to tie the character into the storyline, good reasons to be part of an underground movement that didn't conflict with the Movement or with his being Lawful Evil. So in all of my email correspondence I'm careful to call all the other characters "Cattle" "Slave-races" "Pale-Ears" and I consistently call the gnome a halfling because "all you people look alike". SO much fun. None of the other characters particularly LIKE him, but they respect his keen intellect and massive firepower too much to do anything about it. That and the Neutral human barbarian agreed early on to become his hireling, and nobody messes with "Smashdor". (The character was named Alric, but the druid was named Aelric, so one of them needed a nickname to keep things straight.)
But, through it all, wise-cracking comments are the norm. Can't help m'self, I guess.
EDIT: Thinking about it further, I really love SUPPORT characters, as well. My caster is a support caster ... whipping out wands of Ray of Enfeeblement, Pyrotechnics, Enlarge Person, etc more than FIREBALL or Magic Missile. My Bard was a support character. My Goblin Rogue was purposefully designed to be pretty much useless to account for another character being overpowered. If I want to be a twinked-out broken character, I LOVE the Marshall class. Marshal/Cleric is where its at. I love Dwarves, and my dwarven fighters are usually based around huge untouchable ACs or tactical battlefield control. So ... wise-acres who support the party.
--fje