Bring together any group of gamers, and inevitably they create, often without even realizing it, their own lexicon of buzz-phrases, euphemisms, inside references, and such. As the DM of our group, I've coined a few such gems, sometimes for public use, sometimes for just my own self-reference.
One of my private terms is a "Batman". A Batman is a particular type of player. What, you ask, is a Batman? Is it a player who dresses up in tights and fights crime? No. Is he, perhaps, a grim avenger whose parents were gunned down, and now he swears vengeance on criminals? Again, no. OK, is he perhaps somehow associated with the English game of Cricket? Geez! No! What's wrong with you people?
A Batman, in my lexicon, is indeed based on Batman, the DC Comics superhero. Not the campy Batman, mind you, nor necessarily the grim dark knight avenger, however. Although the modern-day treatment of Batman is more towards the latter, Batman is also characterized as a loner, even when he's on a team. A loner who also happens to be very smart, and whose plans invariably work, mind you, but a loner nonetheless.
Funny how this translates very well into gaming. Once upon a time, I DID have a Batman in my campaign, and in fact he was part of my campaigns for, wow, almost 20 years. Without fail, his characters would be the sort that would slip away while everyone else was debating for 20 real-time minutes about whether or not the badger they just encountered was in fact intelligent, evil, or intelligently evil. Everyone would be yammering away, and there'd be Steve (not his real name), quietly informing me that his character was slipping away from the party, and heading off on his own, trying out a few plans of his and then rejoin the group.
And when people realized that he was gone (yet again), they'd let out howls of frustration. "Dammit, Steve! Stop wandering away!", they'd scream. "Splitting up the party is suicide, especially in JT's games!"
Problem was, while the group was busy discussing if the badger's IQ was inversely proportional to the amount of damage its claws could do, Steve's character had put a plan in motion that would invariably make the party's life easier, if not save their collective, debating arses.
And there was the rub....the rest of the party couldn't complain about Steve's solo ramblings, because 99 times out of 100, his actions directly benefitted the party. When people would ask him why he didn't tell them what he was about to do, he'd simply smile smugly (say THAT fast three times!) and say something like "I didn't want to interrupt your debate!". So, Steve was the Batman of our group. The loner with a good plan.
It didn't matter the system either....D&D, Top Secret (which lends itself very well to executing cunning plans), Star Trek the RPG, C of C, Earthdawn....he was always and forever wandering off by himself, doing good in his own way.
Of course, Steve also had a tendency to play female characters (badly), particulary teenaged girls (really badly), which kind of dilutes the Batman analogy somewhat. He also owned a gun (which really shoots down, pun intended, the Batman analogy), and was a die-hard, Rush Limbaugh-worshipping right winger who'd get into snarling ideological clashes with the die-hard liberals in my group. He rarely smiled (Ok, we're getting more like Batman again), and he was the center of some tension (rather than the center of attention) because this girl who he wanted to ask out turned him down, and she ended up dating (and marrying) another one of my gamers.
As you can guess, although our gaming sessions were fun and exciting, they came with a certain share of real-life tension. Eventually, though, Steve got married, fathered a couple of kids, and had his Air Nat Guard unit activated for the Iraqi conflict, so he got his three main goals accomplished (get married, become a parent, fight in a war), and then sort of drifted out of my orbit. In fact, we're actually not on speaking terms anymore, due to some very much out-of-game issues involving ideology and belief.
Since then, my campaign has been minus a Batman. I don't know if this is a good thing or a bad, and am not quite sure if I miss having a Batman or not. Steve was certainly a very formidable challenge, being a very intelligent man, and I'd like to think that matching wits with him made me a better DM as well ("Iron sharpens iron," he was fond of saying).
So, no more Batman....of course, I've encountered other, lesser known superheroes in my campaigns, including Captain Clueless, Super-Munchkin, RulesLawyerMan, Mega-Bitch, Phlegm-Master, Mister Obnoxious, Angst-Lad, Item Grabber, Constantly Interrupting Woman, Cel Phone King, Major Sweaty Feet, PrimaDonna, Psuedo-Slut, and Major Bummer, but those are stories for other times. 
