Soul Eater

Another of my favourites. It's just amazing. Couldn't stop watching it!

Soul Eater is set at Death Weapon Meister Academy Shinigami Buki Shokunin Senmon Gakkō (Shibusen) for short—located in the fictional Death City in Nevada, United States. The school is run by Shinigami, also known as Death, as a training facility for humans with the ability to transform into weapons, as well as the wielders of those weapons, called meisters. 

Attending this school are meister Maka Albarn and her scythe partner Soul Eater; ninja Black Star and his partner Tsubaki Nakatsukasa, who can turn into a variety of different weapons such as a kusarigama, shuriken, and ninjatō; and Shinigami's son Death the Kid and his pistol partners Liz and Patty Thompson. The goal of the school's meister students is to have their weapons defeat and absorb the souls of 99 evil humans and one witch, which will dramatically increase the power of the given weapon and turn them into "death scythes", weapons capable of being used by Shinigami. More.

It really is the best of the 'popular' ones. The characters, the story, everything will make you love it. It's all you really need in an anime! I recommend this for all ages and believe me you will enjoy it much more than Naruto or One Piece.  10/10