The Yu-gi-oh manga isn't bad either, I mean the show SUCKS but the manga is decent. He kills people hehe. Don't make fun of me for liking it because I have someone who can back me up that it's good
And that would be me. Here are some manga that I think are good and a very short summary of what they are about:
Naruto -- Ninja!
One Piece -- Pirates and a boy made of rubber
Chobits -- A persocom (a computer in human form, basically) named Chi who is though to be a "Chobit," a legendary type of persocom that can actually think and feel.
Trigun -- Gunfights, Vash the Stampede (a legendary gunman)
Cowboy Bebop -- Futuristic bounty hunting and more guns
Bleach -- Ghosts
X/1999 -- The end of the world and the people who could stop it
Yu-Gi-Oh! -- Same characters as the show, except less cards (i.e. there are other games too, such as D&D) and Yugi kills people
FLCL -- Seizure-inducing. I have no idea how to describe it, but it rocks (I've only seen the anime but I'm guessing the manga is very similar).
Yeah, those are all good.