Why is One Piece the best anime?
I could explain this much better, but I'm lazy.
Great cast of characters, all with great backstories and ambitions. Takes up a lot of real life problems and have a bunch of great morals. Amazing story progression of the characters climping their way from rookies to great pirates, without any fate or destiny helping them like in many other series. Fantastic fights, especially later on, where both battlers keep pulling out new moves in some ways. Very touching moments in both happy and sad ways, in fact I've shed tears twice in this anime. The whole series is very well thought out from the beginning down to detail.
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Nio-chan and Ctes: http://img.imgcake.com/nio/Untitledpngyn.png
BroAndCharAndCtes: http://i.imgur.com/oBQfY.png