What is an anime/manga similar or like ...?

Fullmetal Alchemist: Brotherhood - It is the ultimate!

Hunter x Hunter

Hunter x Hunter 2011 (remake of HxH from beginning)

Soul Eater

Toriko

Zetman

Gintama

Jormungand

Yu Yu Hakusho

Dragon Ball

Dragon Ball Z

Dragon Ball GT

Avatar: The Last Airbender

Avatar: Legend of Korra

Inuyasha the Final Act

Brave 10

Birdy the Mighty

Fullmetal Alchemist (not the same as Brotherhood - see difference at the bottom)

Fate/Stay Night

Fate/Zero (prequel to Stay Night)

(Fullmetal Alchemist starts off just like the manga, but the story strays to a different situation. Fullmetal Alchemist: Brotherhood, sticks to the storyline of the manga. There are character, story and other huge differences. Treat them as two different series that have nothing to do with each other)

Either FullMetal Alchemist

DeathNote

Durarara

properly the author of Yu Yu hakusho additionally did a tale called HunterXHunter (a manga). Blood+ has an excellent variety of action and is the two a manga and Anime.Ranma a million/2 a million/2 is a unusual yet humorous one packed with quirky antics and relaxing fights.Soul eater is yet another relaxing one with large tale and action.X-kai is the perfect one i will grant is it rather is a large manga in basic terms study the 1st one yet nevertheless large.

seconding Hunter X Hunter, and Rave Master was created by the same person who made Fairy Tail so you could try that.