Horoboros (ホロボロス Horoborosu) is a mammalian Kaiju from Ultraman R/B. It is described as a great monster with tremendous strength and agility.

Subtitle: Fierce Violence-Beast (豪烈暴獣 Gōretsu bō-jū)


Ultraman R/B

Recoiling from his defeat as Ultraman Orb Dark, Makoto Aizen knocked over his R/B Crystal Collection Case in a rage, only to immediately regret it and pick his crystals up, "apologizing" to them along the way. However, halfway through recovering them, he noticed Horoboros' crystal and smiled evilly as he picked it up, realizing that it could be his next great weapon against the Ultramen. In the Name of Ultraman

Makoto summons this monster during the Minato family's day off while trying to evaluate the Ultramen brothers' performances in battle. Horoboros managed to resist all finishers thrown at it by the Ultramen and knock them out of transformation. Makoto took this opportunity to reclaim his Orb Ring NEO and transforms as he prepares to clean up his own mess.The Minato Family Holiday

Orb Dark seemingly flaunts the monster, trying to look "cool" for the people while he fights. However, Horoboros later pins him down and Orb Dark had to end it by pulling a cheap move, putting it to sleep and then finishing it off with the Dark Origium Ray. After its defeat, its Crystal was picked up by Saki Mitsurugi.

After the defeat of Bezelb, Saki summoned the monster using her own Gyro, and it evolved into its Bipedal form. Aizen's Frenzy Horoboros quickly defeated Orb Dark, Rosso and Blu, leaving all three of their human hosts critically injured before Saki returned it to its crystal. Later, Horoboros was summoned by Saki again and Rosso and Blu fought yet another losing fight against it until Asahi Minato gave the Orb Ring NEO to her brothers, which they used to turn the tides of battle and they finally finished off Horoboros via the Triple Origium Ray. What We Should Protect

In yet another attempt to defeat Rosso and Blu for being 'fake Ultramen', Saki transforms into Horoboros who, at first, easily overcomes the brothers, partially because Rosso was hesitant on fighting after learning of Saki's past.The brothers tried to call upon Ultraman Ruebe, but they were once again denied of the transformaton because of Katsumi's hesitation. Seeing Horoboros approach Asahi and putting her in danger, Rosso and Blu are finally able to transform into Ruebe once more when the brothers are reminded of what is important; their family. Ruebe then defeated Horoboros but decided not to finish off Saki, holding off on firing the Ruebe Vortex Buster. Horoboros the turned back into Saki.Candies and Manju Saki used Horoboros' Crystal to transform again when Kamisori Demaaga attacks but due to her injuries from her previous battle, Horoboros is no match for Kamisori Demaaga. The extradimensional monster leaves, but after that Horoboros collapses, too tired to continue on. Saki uses Horoboros' power for the last time when Kamisori Demaaga was consuming the Ray Lines' energy, but she was defeated once more. Extradimensional Mother


  • Suit Actor: Shun Takanashi
  • Horoboros' name is possibly comes from Horobosu (滅ぼすlit. Destroy) and Ouroboros, a circular symbol depicted a snake (sometimes a dragon), eating its own tail, symbolising the cyclic aspects of nature and life.
  • Many fans have noticed a resemblance between Horoboros and Gukuru Shisa, due to them sharing a lion-like motif, suspecting the former to be a remodeled suit of the latter.
    • Their special attacks are even quite similar in nature, being a jumping slam.
    • Horoboros however combines both feline and canine motifs, the latter being visible in its bipedal form and its roar is the howling of a wolf.
  • Originally, his debut was going to be in episode 11, according to the timeline of an early toy catalogue.[1]
  • This is the first kaiju to defeat an Ultra without using any special powers or outside influence whatsoever (to the point of reverting them back to a human).
    • Although Red King seemingly accomplished the feat earlier in the series, he had the help of using Rosso's Splash Bomb against him.
  • In its bipedal form, Horoboros' roar is occasionally mixed with that of Melba.



Horoboros' Quadrupedal (四足時 Shisoku-ji) form, in which it has large front paws and walks on all fours. Its eyes are yellow.

  • Height: 44 m
  • Length: 48 m
  • Weight: 44,000 t
  • Origin: Ayaka City
Powers and Weapons
  • Deflection: Horoboros is capable of deflecting beams such as the Sperion Ray with its paws. It also managed to deflect the Storm Shooting while breaking free of the Ground Coating's effects.
  • Durability/Endurance: Horoboros is able to endure repeated finishing attacks from Rosso and Blu, including the Zedcium Ray and Gravity Slasher, and still continue fighting afterwards.
  • Strength: Horoboros has plenty of brute strength, allowing it to manhandle both Rosso and Blu easily and break free from being covered in stone by Rosso's Ground Coating.
  • Agility: Horoboros is one of the most agile Kaiju in the Ultra Series, being capable of running at high speeds and performing acrobatic maneuvers in midair.
  • Extraordinary Jumper: As a feline-themed monster, Horoboros demonstrated the ability to leap at an incredible height.
  • Mid-air Kick: Horoboros leaps towards its target in mid-air at high speeds, performs a somersault of sorts, and kicks the foe towards the ground. This attack is strong enough to revert an Ultra back to their human host in an instant.
  • Evolve: When summoned by Saki Mitsurugi, Horoboros evolved from its Quadrupedal form to its Bipedal form.


Horoboros' Bipedal (二足時 Nisoku-ji) form, in which it stands on two legs and has hands with large blades on its arms, mirroring a Werewolf's characteristics. Its eyes turn red in this form. Horoboros retains all of its abilities from its previous form.

  • Height: 56 m
  • Weight: 44,000 t
  • Origin: Ayaka City
  • Maximum Running Speed: Mach 4.5
  • Maximum Jump Height: 950 m
  • Brute Strength: 198,000 t
  • Grip Strength: 100,000 t
Powers and Weapons
  • Horoboro Claw (ホロボロクロー Horoboro Kurō): In exchange for both of its paws, Horoboros gains claws on each arm.
    • Megante Crusher (メガンテクラッシャー Megante Kurasshā): Its claws can generate a wide purple energy slash, and can cause a fatal blow to opponent after it hits. When used at full power, Horoboros gains an aura.
    • Claw Empowerment: Horoboros can generate an energy impulse to empower its Horoboro Claw and pierce through an Ultra Armor.
    • Deflection: Like his paws in his Quadrupedal form, Horoborus can ultize it's claws to deflect incoming energy attacks.
  • Strength: Horoboros retains its quadrupedal form's brute strength, able to lift two opponents at once simply by holding them by the neck.
  • Endurance: Horoboros retains the same hide from its previous form, being capable of resisting standard finisher beams. It can also negate Orb Dark's paralyzing attack.
  • Accelerate: When transformed into by Saki, Horoboros can accelerate to high speeds.
  • Burrowing: Horoboros can burrow at least at moderate speed, and can jump out of the ground.


Ultraman R/B Kaiju & Seijin
Ultraman R/B Grigio Bone | Cereza | Black King | Gargorgon | Red King | Gue-Basser | Mecha Gomora | Aribunta | Ultraman Orb Dark | Gomess (S) | Horoboros | Bezelb | Gubila | Grigio King | Neronga | Pigmon | Booska | Dada | Alien Zarab | Alien Mefilas | Alien Chibull | Alien Bado | Alien Pitt | Alien Nackle | King Joe | Grand King Megalos | Gomora | Kamisori Demaaga | Grigio Regina | Reugosite
Ultraman R/B The Movie: Select! The Crystal of Bond Bemstar | Gan Q | Alien Pegassa Pega | Mecha Gomora | Snake Darkness | Pigmon | Grigio Regina
Ultraman R/B Novel: The Blue-Eyed Girl Whose Name is Gray Bakubarba | Nero | Margodon | Grigio | Fearmonger | Alien Egon Ciel | Barrigator No. 1 and 2 | Reugosite
Community content is available under CC-BY-SA unless otherwise noted.