My guess is that the author (Stephenie Meyer) is an INFP. From what I've read of her work, she's very much an Fi type, and her zany notions about how vampires, werewolves, and the like work are clearly Ne. I mean, how could anything but Ne come up with glittering vampires?
Therefore, the main character Bella is very likely written as an INFP, seeing as the writer seems to be pouring herself into the character. (I would assume this is a common trait with IxFP writers.) She's emotional, open to possibilities, non-judgemental, and the only thing about her that isn't INFP is that she's got a lot more guts - I'm sure because in the author's perfect world, she does too.
Charlie Swan, the dad, is most likely based on the author's own dad. He's one of the more genuine characters in the show, and he's very clearly an ISTP. The ISTP / INFP lack of ability to synchronize is legendary, and perfectly portrayed in this film. No doubts here. The character is far too genuine not to be based strongly on a real life person that the author knows as intimately as a child knows a parent.
Edward is clearly written as an INTJ - which from what I understand is the INFPs kryptonite. No suprirses here if the writer is egocentric and writing a romance novel, then obviously the male lead is going to be her 'ultimate guy'.
Alice -the psychic- Cullin is written as a wierd mix of ENFP and INFJ, which comes off to me as the writer knowing an INFJ but only really understanding that INFJ's ENFP side, or worse, simply forcing her own sensibilities into the character because she (the writer) can't grasp how INFJ minds work, in which case she's mocking INFJs with this character (unlikely for an INFP to do). I think it's most likely the former. She knows an INFJ in real life who does a lot of that 'psychic' stuff, but wants her to loosen up and be more like this character. Clearly Twilight is the INFP author's fantasy world where everything is as she wants it.
Jacob is clearly an ISTP. He sees things as they are, lives in the now, fixes things, is quiet, and generally detached emotionally. He's the reliable guy that women seem to always look at as a back up plan in case the 'ultimate guy' doesn't pan out, and I doubt there is another type that would fill that role in the INFP author's mind better than an ISTP - especially when her real life father is likely this type. Freud would be proud.
Jasper... the crazy one that seems alarmingly close to coming out of the closet... is probably the least likely to have any real life character reference other than an ENTP that annoyed the author when she was younger and she still has no idea why.
And then there's the villain of the story - Victoria. I have to stop a moment and swoon over the actress here... (Rachelle Lefevre). Rowr... okay... where was I? Oh yes, this chick is CLEARLY based on the INFP author's ENFJ worst nightmare in real life. It is clear that this character is based on an ENFJ who found fault with something the INFP did (and of course INFPs never do anything wrong) and when the ENFJ tried to correct the behavior, the INFP decided she was a villain and was out to get her. This character has very clear ENFJ traits. She doesn't quit. She bases all of her motivations on her ideals. And, she's a flaming bad ass. If you doubt this character was based on an ENFJ, you don't know one, heh.
(You guys didn't seriously think I'd bring this up and not turn it into a fairly serious discussion about Jungian archetypes did you?)
