Since you watched Naruto, you should really give Bleach another try. It's a long show, but it's better than Naurto, or any of the other uber popular shonen animes (one piece, fairytale, inuyasha etc). If you want a taste of how epic the fights will get, look up like Ichigo vs Renji. The first time they fight for real is pretty fucking solid, and that's NOTHING compared to how awesome the fights get, and once they get inside the soul society, shit just goes down constantly, it's epic fight after epic fight, and then the show continues to pick up after that. There's lots of filler, but you can use a guide to skip all that bullshit if it bothers you. I do recommend watching the filler the first time you watch the show though, but it's not necessary.
Dark
Deadman Wonderland
Future Diary
Claymore
Monster
Kinda Dark
Code Geass
Basilisk
Psycho Pass
Angel Beats
Black Butler
Akame ga Kill!
JoJo's Bizarre Adventure
Not Dark/Comedy Vibe
Samurai Champloo
Full Metal Alchemist Brotherhood + Full Metal Alchemist Original
Blue Exorcist
D Gray-Man
Soul Eater
Guilty Crown
Black Lagoon
Chrome Shelled Regios
Fate/Zero
Fate/Stay Unlimited Blade Works
K
These are a bit dated, but still amazing.
Yu Yu Hakusho
Outlaw Star
Trigun
Berserk
Cowboy Bebop
Rurouni Kenshin