Crusader is the Pissweak Batman hybrid. He's based on a combination of the Dark Knight himself and Midnighter from Wildstorm, (now DC) and Warren Ellis' awesome superteam, The Authority.
Both Batman and Midnighter don't use guns, well Batman kind of does sometimes and Midnighter literally carries a big stick but the folklore is "no guns". Crusader loves guns. He's also partial to flame throwers and grenade launchers as well as swords, nunchucks and self-powered artillery.
Crusader is an Australian Porn-Billionaire who made his fortune through several world-beating innovations in the field of pornography that he himself invented. He has applied some of the technology to his own weaponry, most effectively in his vibrating Samurai Sword that brings turkey-carver style cutting action together with a blade made out of alien metal (that he bought from some stoners he met at a bonfire party in Roswell, New Mexico) that has an edge just five atoms wide. Five atoms wide is also the estimate that Crusader's former girlfriend, UltraBabe places on the size of his manhood.
Like Batman, Crusader is one of the few mortal superheroes and he has a huge chip on his shoulder about that. Unlike the rest of the Justice Super Team he has to deal with traffic, bullet wounds and costume chafing.