I know as good as nothing about anime or manga, but i'd like to start with it because i watched some one piece, naruto and DBZ ofcourse when i was a kid and i've been looking in to it all but i'm a pretty comitted guy so i'd like to start with an idea of what the anime is like.

I like to watch stuff rather than read so i need a recommendation for an anime. Things i'm looking for:

>action similar to naruto or dbz, no guns or shooting just knives blades and fists (maybe powers)
>adult protagonist or at least someone who isn't an ignorant enthousiastic kid
>"adventure"
>has cool and badass antagonists

Think that's about it. Got Hunter x Hunter and Bleach from a friend but i don't know if those are good to start with.