Guiron's Japanese name Giron (ギロン) is most likely a truncation of the Japanese word for guillotine, girochin (ギロチン), a clear reference to the monster's sharp, blade-like head. In English, the monster's official name is "Guiron," but the spellings "Guilon" and "Guillon" have been used in official merchandise as well.
In earlier scripts for Gamera vs. Guiron, Guiron was simply called Giant Evil Beast X (大悪獣Ｘ. Dai Aku-jū Ekkusu)
Guiron is an alien monster that normally walks on all fours, but can also stand on two legs when the situation requires. It is an unusual looking creature, with tough gray skin, a small mouth, sleepy looking eyes and a low, groaning bellow. The most unusual feature of this beast's anatomy, however, is the gigantic blade that it sports on its head, which is nearly as long as its body.
Guiron acted as the guardian dog of two brain-eating space women, the last of a dead civilization on the planet Terra, and lived in a special hangar under a stream at the Terran Base. The aliens guided him with a mind control device. Before the Terrans revealed their true intentions, Guiron proved his combat prowess by effortlessly killing a Space Gyaos, reflecting its sonic cutter beam and literally slicing it to pieces with his blade. Guiron later fought Gamera, and nearly killed him as well, before returning to base. After the two kids activated the doors to Guiron's home, he once again came back from below ground, and destroyed the Terran Base. The fire given off by the burning buildings revived Gamera, who challenged Guiron to continue the fight. After a long fight in which Gamera used new acrobatic techniques to try and outsmart Guiron, Gamera eventually managed to defeat the knife headed beast by flipping him upside down - his blade stuck in the earth - then igniting a missile that had gotten stuck in his circular indents, blowing off the upper half of his body and killing him.
Guiron is mostly a melee-oriented kaiju. Almost all of his abilities revolve around the massive blade he sports on his forehead. It is strong enough to reflect a blast from a Space Gyaos and cut Gamera's shell. Due to Guiron's blade only being usable as a weapon at close range, Guiron will resort to his secondary attack, a pair of four shurikens stored in two circular indents in the blade. These shurikens are incredibly sharp and also induce severe bleeding in any opponent they hit, enough to render Gamera unconscious in mere minutes. Guiron can guide these shurikens using telepathic waves. They were sharp enough to cut right through Gamera's arms and lacerate his temples to the point of unconsciousness. In addition, despite his bulky appearance, Guiron can be extremely agile in battle, as noticed when he was able to leap high into the air to take down Space Gyaos.
- Gamera: Guardian of the Universe (1995) - Nintendo Game Boy
- Gamera: The Time Adventure (1995) - Bandai Playdia
- CR Gamera (2009) - Pachinko
- Gamera: Battle (2012) - iOS
- Monster Gear (2015) - Android, iOS
Guiron in Monster Gear
- Main article: Guiron/Gallery.
To better serve his role, Guiron's roars almost sound dog-like, consisting of low growls and resonant roars. After Guiron kills the Space Gyaos by beheading it, he can also be heard making a low, guttural laugh.
These roars were later used for the Allosaurus in the BBC television show , Walking with Dinosaurs.
- Guiron is referenced in Gamera the Brave. When Toto is exploring the house, Toru's father accidentally knocks a knife off a counter while he is cooking. The knife sticks into the floor, and Toto breathes fire at the blade.
- It has been popularly speculated that Knifehead, a kaiju from Pacific Rim, was possibly inspired by Guiron, also possessing a blade-tipped head. However, in a two-part interview with Ain't It Cool News, Pacific Rim director Guillermo Del Toro revealed that Knifehead was not inspired by Guiron. According to Del Toro, Wayne Barlowe, who drew a silhouette that became Knifehead in the final film, had never heard of Guiron when he drew the silhouette. Del Toro acknowledged in the interview the resemblance between the two kaiju, though he further noted that upon comparison the two kaiju "don't look alike."
- Guiron's skull makes a brief appearance in Pacific Rim Uprising, during the scene where Hermann Gottlieb examines PPDC records in search of a match for the image Mako Mori transmitted.
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