In one Predator comic, one of the characters held the titular Predator's head as a trophy at the end."Halloween!" ( Shock SuspenStories #2) ends with a presentation of the villain's head turned into a Human Jack-O-Lantern.The infamous cover of Crime SuspenStories #22.This is somewhat toned down with a Gory Discretion Shot in the animated film. In Batman title "Under The Red Hood", Jason Todd arrives at a meeting of various mob bosses with a duffle bag containing the heads of their lieutenants.In Sword Art Online's Alicization arc, one of Vecta's first displays of power and brutality is him presenting the head of his would-be assassin, Lipia, encased in a block of ice.After drinking blood from the severed head and making a bit of casual conversation, he proceeds to massacre all but one member of the squad. In :Re, Takizawa's changed state is established by him casually decapitating a high-ranking Investigator.In the Prequel Jack, Lantern is introduced holding up the severed heads of two recent victims.Tokyo Ghoul employs this on several occasions, to establish particularly brutal Ghouls.
It's worthy of note that the character who does this is not an Anti-Hero but rather one with a strong sense of duty, Miria does this so that the other Claymores do not break their rule that prohibit them from harming Humans and only she will have Human blood on her hands.