Shinji ikari
And yes he is as we say "a pussy" heh.
Well, about all the screaming and such: It sets the mood of the whole series.
It's not one of those lovey-dovey animes, and it's not a childrens anime(due to all the biblical background to it) and it's not a comedy at all. Really an high teen/adult-ish Sci-Fi, biblical-ish anime.
The screaming and all fits well really. Alot of people don't really understand the true meaning of the storyline and it's connections to the bible.