One piece
It is one of the most popular Anime ever watched. But due to its length I saw a heavy drop in middle of watching the series. And that's why I will tell you why this Anime is my favorite and will be forever. To begin with let's start with the length, yes it has 900+ episodes and that's what I think is the key. For me I wanted to have fun that lasts longs and one piece is best for that. Currently I am in dressrosa arc and things are getting really intresting. For those who started just now, let me tell you this HAVE PATIENCE, you will definitely have fun with lots of action, comedy, drama and many more. Manga and Anime both are really awesome any one can begin with either of this and in addition to that special episodes and movies are really amazing. Hope you like this, and keep watching & reading Anime and Manga.