|First appearance:||Mirrorman Episode 28: "Written Challenge from Killergon: The Killer Monster"|
Subtitle: Killer Monster (殺し屋怪獣, Koroshi-Ya Kaijū)
- Height: 50 m
- Weight: 47,000 t
- Origin: TBA
Powers and Abilities
- Long Tongues: Killergon has maws in place for his hands which unleash long tongues that can serve as whips.
- Snout Horn Beam: From the horn on his snout, Killergon can shoot a beam from it.
- Mace Tail: At the end of Killergon's tail is a mace which he uses to hit his opponents.
- Electric Tongues: The long tongues that come out of the maws can charge electricity to shock his opponents.
- Killergon's suit would be used to make Kemjila.
|Mirrorman Kaiju & Seijin|
|Iron | Kitty Fire | Darkron | Multi | Noppera-bō | Inbera | Kitty Fire II | Gold Satan | Iron II | Multi II | Invaders | Gravity Machine | Zailas | Shinjuku Rose | Gold Satan II | Noah | King Zaiger | Iron III | Kitty Fire III | Zailas II | Jabala | Kinder | Chamelegon | Aroza | Big Eye | Sphenodon | Darkron II | Taigan | King Wonder | Androsaurus | Coldon | Haebun | Gokibura | Mothgojira | Dustpan | Snake King | Harigojira | Killergon | Gorgosaurus | Mayasaurus | Arigeida | Killersaurus | Pair-Mons King | MoleKing | Smoke Ness | Pair-Mons King β | Gorgosaurus β | Mayasaurus β | Halley Jack | Androsaurus II | Androsaurus Jr. | Magumagon | Zangani | Shadow Mons | Teroringa | Invesaurus | Ghost | Boasaurus | Black Gon | Red Mons | Giranda | Borezaurus II | Iezu | Eletrikzaurus | Dead King|