This is my Favourite in my opinion:
-Katekyo hitman Reborn!(1-20 ep is pretty slow)
-HunterXHunter(pretty good)
-One Piece(very fast charac developement)
-World Trigger(I recommend this)
-Log Horizon(doesn't tell us the story that much)
-Sword Art Online(action-packed)
I've watched a lot of...