I prefer the heroic save as many people as you can type. They don't even have to be particularly heroic, they just need to be the sort of character who cares for their friends and looks out for them.
As for the villainous type, I've known a few people in my life who would stab me in the back given half a chance, a couple even tried it, and you've only got to read the papers or watch the TV news to find the type who would like to bring the world to its knees so I don't really need them in my anime.