Whether you refer to yourself as The Dark Defender, Kyle Butler, or that guy that does the voiceover in the Dodge commercials is up to you. When you start feeling a buzz, you may consider discussing with other party-goers the morality of your costume character's life decisions: Is it truly justice? Does a serial-killer-killing serial killer have a place in society? Can one man be judge, jury, and executioner? But again, that’s up to you. Or you could just use your expertise as a blood splatter analyst to comment on the accuracy of the fake blood on people's costumes.
Be stealthy out there! Safe… I meant safe. Be safe out there, killers!