"He decided that he could be helpful for those buddies he had got, IF HE COULD JUST END THEM ALL..."
I have officially lost it. I'm proposing a candidate from an Among Us fan work...
What's the work?
He Was the Impostor Not is a song by MiatriSs and Dmitry Syenduk based on the Among Us video game. It tells the story of a crewmate who is falsely accused of being an impostor and ejected. He then dies and meets the ghosts of other ejected impostors, and it seems like he'll be able to find peace in the afterlife...but no.
Who's the candidate?
Red is the main protagonists. He starts off as an "ordinary fellow, quiet, nice and pretty mellow". He just minds his business, doing assignments, until he stumbles upon the corpse of another crewmate. Everyone accuses Red of being the killer, despite having no proof, and eject him. The impostor was actually the white crewmate, who proceeds to kill three other crewmates while red is watching, and board a laser canon to finish the poor guy off. Struck by it, Red crashes into an asteroid and dies, becoming a ghost. He flies inside, and discovers that it's become home to the ghosts of other ejected crewmates. They accept Red and promise to treat him well.
But soon Red starts growing suspicious of other ghosts. After all, some of them could actually be ejected Impostors, plotting to restart their killing spree...he confronts a white ghost, accusing him of being the one who killed him. When he pleads innocent, something twitches inside Red...He turns black, gets a nightmare face...and swallows the other ghost. He is initially horrified, but then goes completely nuts, believing that the only way for him to hel his friends is to kill them all, absorbs all other ghosts, and sends out spores that become the new impostors. One of them lands on the same spaceship Red was ejected from, and ambushes the remaining two crewmates...
Heinous standards
Red is pretty much the most heinous character in the music video, despite being the main protagonist. He kills hundreds of ghosts by eating them, and then sends out spores that become new Impostors and will likely kill even more crewmates. His only competitor is White, who, while a valid PE candidate in my opinion, has a much smaller kill count of only six people. Adding to it, while he is responsible for Red becoming the monster he is, he had no idea this would happen.
Mitigating factors
While Red has a clear personality, and has gone off the edge by the end, I still think he is portrayed too sympathetically to be NPE. He just minds his business, then his friends eject him for no reason, then he gets killed...Also, it appears that he has gone insane by the end, even believing that he is assisting his friends by killing them, as the song mentions. There's a brief moment where he is horrified at himself having killed a fellow ghost, before snapping back and continuing his rampage, which convinces me that he's lost any semblance of moral agency he once had.
Verdict?
Yes.