Atton. Used to be a Sith agent, quit that, can become a Jedi, plays Passak or whatever in his head as a technique to keep Jedi from reading his mind. I forget how the rest sync up, but that's close enough.
Bingo.
1. I kill people for fun.
Atton captured and/or killed Jedi for the Sith. He didn't do it for political reasons, he did it because he hated them and enjoyed watching them die.
2. Not so much anymore. I'm more a recovering addict than anything.
Atton quit and tried to put it behind him. Kreia knows, though, and she blackmails him with it.
3. I <3 half-naked ladies. Especially with good senses of timing.
The Exile is female. Atton is rescued after two days in that forcefield. One more day, and he probably would have died of dehydration.
4. Speaking of clothing, I start out sensibly dressed, but end up in a bathrobe with a glow stick.
Atton becomes a Jedi. A pretty decent one, if you build him right, since he becomes basically invincible at low health.
5. I don't care if his name is Mark, Luke or Mical, he's still going to get a face full of electric death.
Mical is "the Disciple." You know, like Mark and Luke and Paul and... um... Judas? Anyway, Atton and Mical are romantic rivals for the Exile. In one of the cut endings, he does indeed murderize the Disciple with Force Lightning.
6. I count cards, but it's not to cheat in casinos. It's to keep them outta my head.
Atton plays Pazaak, memorizes hyperspace routes, or counts engine sequencers to prevent Jedi from reading his mind.
7. My criminal tendencies come in handy, and not just during the adventure. If I hadn't gotten locked up, those robots would have "mined" out my internal organs just like everyone else on this rock.
If he hadn't been arrested on Peragus, the mining droids would have killed him too. Instead he was the only survivor besides Kreia and the Exile.
I'd like to give extra-special recognition to Dune for only guessing characters from games I've never played, though.