I happen to think there's some variety in Bergman, but I'm probably overthinking it. There is certainly something called "Bergmanesque."
But then, Kubrick's cold, detached uber-intellectual approach never changed much either, even if he did play with different genres.
And the more I think of it, Kubrick really did suck with characters, Kirk Douglas' stuff being a good exception. For example, I can't think of any memorable female characters at all. The women serve to push or frustrate the men's desires, and that's about it.
And 2001? The only interesting character in that is a fucking computer.