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Fanfic / Slender Man vs Siren Head

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Slender Man vs Siren Head is a fanfiction written by Sum Dum Nerd/NerdWithAKeyboard. The story began in May of 2020 and was completed in May of 2021.

It is a Crossover story detailing the meeting and subsequent battle between Slender Man and Siren Head.

Slender Man vs Siren Head contains examples of the following tropes:

  • Adaptational Villainy: Both Slender Man and Siren Head are sentient, both killing for fun.
  • Aloof Big Sister: Something Cassidy regrets after Vic goes missing.
  • Arch-Enemy: Trevor grows a seething hatred of Siren Head after he slaughters his boot camp. On Siren Head's side of the things, he screwed with Trevor’s head For the Evulz, slaughtered Trevor's camp to spite him, and he’s definitely not to fond of the human that keeps escaping and hurting him.
  • Ax-Crazy:
    • Slender Man is pretty brutal in his murder of Alex, tearing them in half and looking upon the mutilated corpse with satisfaction.
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    • Siren Head slaughtered Trevor's boot camp just to spite him, and the corpses weren’t pretty.
  • Big Bad Ensemble: The Slender Man and Siren Head are on different sides of the conflict, but both are equally evil monsters.
  • Big Sister Bully: Cassidy was this to Vic, and regrets it when he goes missing.
  • Crossover: The fic combines two infamous internet horror characters, the Slender Man from the mind of Victor Surge and Siren Head from the mind of Trevor Henderson.
  • Cruel and Unusual Death: Slender Man has a smaller on-screen kill count compared to Siren Head, but he makes up for it with horrific brutality.
  • Cruel Mercy: Siren Head could’ve killed Trevor after slaughtering his boot camp, but he wouldn’t have suffered.
  • Decoy Protagonist:
    • Cassidy was investigating the Slender Man after he took her brother, and you’d think that’d be a decent story in its own right, but she’s captured and possibly killed in the same chapter she’s introduced.
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    • Alex, her boyfriend, lasts a little but longer, but is killed towards the end of the 4th chapter.
  • Evil Is Petty: Slender Man and Siren Head bump into each other while chasing down their respective victims (Alex and Sophia for Slender Man, Trevor for Siren Head) and both put a pin in their chases to try kill each other just because they don’t like the sight of the other.
  • Evil vs. Evil: Slender Man and Siren Head are both killers who murder for fun, and the plot of this fic is them fighting.
  • Faux Affably Evil: Slender Man’s means of communication is through words his victims "see" in their heads, and they’re always polite and cheerful, even as he chases them down to brutally murder them for fun.
  • For the Evulz:
    • Slender Man is having a dandy old time slaughtering children.
    • Siren Head was psychologically torturing Trevor before the latter went to confront him for no reason, keeping him awake at night using sounds, making everyone at his boot camp think he’s crazy.
  • Hate Sink: Neither Slender Man or Siren Head are easy to root for, as both are murderous monsters that kill For the Evulz and like to rub it in to their surviving victims.
  • Jerkass:
    • Slender Man leaves one of Cassidy's vandalized missing posters for Sophia (her best friend) and Alex (her boyfriend) to find.
    • When Trevor curses Siren Head for killing his comrades and burning down his boot camp, Siren Head mockingly mimics a fire alarm.
  • Jerk with a Heart of Gold: Trevor is grouchy, but he unhesitatingly saves Alex and Sophia when he bumps into them while running from Siren Head, and couldn’t stomach to watch the former get torn apart by Slender Man.
  • Mythology Gag: Slender Man's first victim in this story is a young boy named Vic, named after Victor Surge, his creator. While Siren Head's Arch-Enemy is Trevor, names after Trevor Henderson, his creator.
  • Nice Guy:
    • Alex is kind and protective boyfriend, willing to risk getting hurt or worse going into the forest to look for his girlfriend.
    • Sophia tried her best to comfort Cassidy, and while more reluctant then Alex, still agreed to go to the forest to look for her and Vic when they go missing.
  • Psychopathic Manchild: Slender Man treats his killings like a game, even giving Cassidy a childish "found you" after asking to "play" hide-and-seek with her.
  • Sadist:
    • Slender Man takes sick delight in torturing and killing others, especially when he kills Alex.
    • Siren Head's sentience is a lot less noticeable then Slender's, mainly because he has no way of communicating, but he shows a spiteful side and really likes screwing with Trevor.
  • Serial Killer: Slender Man has quite the rap sheet of victims prior to the beginning of the story.
  • The Sociopath: Both Slender Man and Siren Head are sentient. No Blue-and-Orange Morality, just vicious sadism.
  • Would Hit a Girl: It’s very possible Slender Man tore up Cassidy.
  • Would Hurt a Child: Slender Man targets kids, though he’s more a Serial Killer that prefers children than his usual mysterious Blue-and-Orange Morality.