What are these about.. and what's this?

I'm bored now, playing games gets boring..
What are these animes about;

Elfen Lied (never heard of it until recently?)
Shaman King
Death Note
Inuyasha
School Rumble

And, there's this other one I enjoyed playing in a game.. it's like something yo yu yaky.. Argh, played it AGES ago but I still remember it :/ Don't remember how it was spelt

Edit: Also, what's hentai

Elfen Lied is a story about a psychotic girl who has the powers to basically kill people with invisible hands.
Shaman King is about a kid with a spirit that transforms to help him battle
Death Note is thinker anime, about how a guy who can right ppl's names down to kill them gets away with it.
yuyuhakasho is a old anime, but its basically about spirits and demons and fighting.