If there is going to be a list of anime characters who receive the most mixed reactions from the fans, it would be safe to assume that One Piece's Vinsmoke Sanji would surely make it to the list. One Piece fans have hated, seen grow, and started loving the character of Sanji over the years. Sanji has one of the most interesting and engaging character arcs in the franchise. Without a doubt, his is one of the saddest backstories of all time in One Piece. His life journey ranges from the worst of the days to balanced days to the best of the days.