Actually the Katie Holmes character, Rachel and the Rutger Hauer character, Earle (the guy in charge of Wayne Ind.) are the only ones who DIDN'T come from the comic book. Everybody else (the Waynes, Joe Chill their murderer, Falcone, Ra's, Ducard, Crane, Gordon, Alfred, Lucius Fox) do. Rachel was the weak link in the film IMO. Not her personally but the character itself was unneccessary. Bruce Wayne doesn't NEED a love interest. His villians are interesting enough. Besides we know that they'll never last (even his two main love interest in the comics, Selina/Catwoman and Talia, Ra's Al Ghul's daughter go in and out of his life). Bruce Wayne's great love is Gotham City, thats what drives him.
But it was indeed a GREAT, GREAT movie. Probably the best adaptation of a comic book superhero I've ever seen (and I'm counting Spiderman and Superman). Bale was fantastic and this puts him in the top tier of actor - from now he's going to be a superstar. Caine, Neeson, Watanabe, Wilkinson, Freeman (all talented and either Academy-awarded or nominated actors) are just great in supporting roles and Cillian Murphy despite his pretty boy face was suitably creepy as Crane/Scarecrow. One of my fave actors, Gary Oldman, shined again as well, playing against his usual role, as an honest cop and blue-collar good guy who in his way is as much as hero in corrupt Gotham as Bruce. Chris Nolan has instantly become one of my favorite directors and...I can't wait to see it again!