These are characters that are designed to die. Their deaths move the story along and in the best cases have an emotional impact on the main character. Sometimes they are an important figure in the story not completely related to character but pushes the story into a specific direction in many ways they are sometimes considered secondary characters. IMO the best sacrifice are the ones that were emotionally connected to the main character. I want to know who is the best sacrificial character out there and it could be one that we presume dead like in Avatar (Jet i know not a manga or anime) or in One Piece where the characters dont always die in plain sight of the audience. If you want you can include characters that were brought back to life if you give a good reason.