Home world: N/A
First appearance: Ultraman R/B episode 10 "The Minato Family Holiday"
Latest appearance: Ultraman R/B episode 12 "What We should Protect"
Height: 44 m ~ 56 m
Weight: 44,000 t
Category: Kaiju
Affiliation: Makoto Aizen (Summoner)
Saki Mitsurugi (Second Summoner)
Roar(s): TBA

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


  • 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 to be a remodeled suit from Gukuru Shisa.
    • Their special attacks are even quite similar in nature: being a jumping slam.
    • Horoboros however combines both feline and canine motif, 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 into 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's 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
  • 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.
  • Megante Crusher (メガンテクラッシャー Megante Kurasshā): By using his tail, Horoboros leaps towards its target in mid-air at high speeds, performs a somersault of sorts, and whips 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's 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 are red, suggesting it's an aggressive form. Horoboros retains all of its abilities from its previous form.

  • Height: 56 m
  • Weight: 44,000 t
  • Origin: Ayaka City
Powers and Weapons
  • Giant Claws: In exchange for both of its paws, Horoboros gains claws on each arm.
    • Horoboro Claw (ホロボロクロー Horoboro Kurō): 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 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.


Ultraman R/B Kaiju & Seijin
Grigio Bone | Cereza | Black King | Gargorgon | Red King | Gue-Basser | Mecha Gomora | Aribunta | Gomess (S) | Horoboros | Bezelb | Gubila | Grigio King | Neronga | Pigmon | Booska | Dada | Grand King Megalos | Kamisori Demaaga | Grigio Regina | Reugosite