Lol, black butler. Love that one. It's about a devil contracted to an emo kid. Lots of comedy, but it has some more "demonic" parts as well. There's One Piece if you crazy action comedies where each battle is at least 10 chapters long. You are also guaranteed to cry at some points. Fairytale's art style is nearly identical to One Piece because they were trained by the same teacher. About wizards with interesting skills. Fullmetal Alchemist is about two young alchemists who perform human transmutation, and pay the price for it. More of a smart-boy show. Shaman King follows a laid-back kid who can communicate with ghosts and spirits. He fights to become the Shaman King against other shamans with interesting skills. Kamichami Karin is a girly manga about a girl who was granted the power of a goddess. A comedy story, little romance, bit of action. Anima+ are humans that have powers of animals. A crow anima and fish anima becomes friends and have adventures.
But wait- there's more! Yotsuba is a young girl who gets into all kinds of mischief. Very funny and adorable. Wish is about an angel who wants to grant a wish to a human. Girly, romance. InuYasha is a half-demon in old Japan. Kagome meets him when she falls into history. Action, romance, adventure, comedy. Ranma 1/2 features a young boy who turns into a girl when water is poured on him. Action, Comedy, romance. Zach Bell is a little puppet demon who must fight with his human partner to become king. Comedy, action. Death note is about a genius who found a notebook that can kill anyone if he knows their name and face. He goes crazy and goes against the greatest detective in the world. Suspense, mystery, I guess ? Lots of these you might have heard of.
I know, that you might know. But I know that you might not know. In fact, you know them because they're pretty well known because they're good. I can suggest some bad ones if you like that better.
Naruto Shippuden Naruto Dengeki Daisy Fairy Tail Inu x Boku SS Kaichou Wa Maid Sama Ouran High School Host Club Anohana Panty and Stocking with Garterbelt Fruits Basket Black Rock Shooter I'm pretty sure I'm missing a shitton of names, but here are some to satisfy your otaku hunger.
Manga: Naruto Fairy Tail Kuroshitsuji Dengeki Daisy Inu X Boku SS Kaichou Wa Maid Sama Ouran High School Host Club