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This article is about a/an villainess in Kamen Rider OOO.
Mezool Human
Gender: Female
Villain Type: Rogue
Season: Kamen Rider OOO
Affiliation: Greeed
Homeworld: Earth
First Appearance: Medals, Underwear, and the Mysterious Arm
Last Appearance: Kamen Rider × Super Sentai: Super Hero Taisen
Number of Episode
26 (OOO)
4 (Movies)
Full list of appearances
Actor: Yukana (voice)
Honoka Miki (Human form)
Mezool Complete
"Don't get in our way, OOO boy."
―Mezool to OOO in their first encounter[src]

Mezool (メズール Mezūru?) is a minor antagonist in Kamen Rider OOO. She is the aquatic animal Greeed as well as the only female Greeed, and has aspects of the killer whale, electric eel, and the octopus.


While Mezool like the other Greeed, has little sympathy towards humans, she is the most kind of the desire powered Greeed, shown when she willingly shared some of her medals with Gamel and the others despite being incomplete. She serves as a mother figure to the others, as her desire is to know and feel true love, reflecting in her relation to Gamel and her human form of a high school-aged girl. However after she was stripped of most of her Core Medals, and the other Greeed decide to take matter into their own hands she loses dominance and control over them. She is very close to Gamel and after he goes through a mental breakdown and possessing too much power she absorbs him to put him out of his misery and make sure the power doesn't go out of control, but also to regain her Core Medals. However, upon receiving her full power, she discards him and goes off on her own in order to achieve her desire.


Like the other Greeed, Mezool can create Yummies from a human's desires through a Cell Medal, unlike Uva and Kazari's that start off as White Yummies, Mezool's fish-based Yummies first become roe-like eggs, which indirectly feed off the human's desire while forming a "nest" that incubates over a period of time while the human indulges their desire, their presence mostly concealed until they hatch into their complete forms either all at once or one at a time. Mezool's human form is a high school aged girl that wears either a sailor uniform, a blue coat, or a light blue shirt. Mezool on her own can create and control water (hydrokinesis) and has high agility. In her complete form, Mezool can liquify her body and seal mother/child pairs in her Yummy eggs. While they are in the eggs, the love and life are sucked out of them until Mezool is defeated.

Giant Greeed

When Mezool absorbs Gamel in his complete form and inadvertantly two of Uva's Core Medals and over 5000 Cell Medals, she transformed into a Giant Greeed, an aquatic monster that features aspects of Mezool's motifs as well as having heavy animal features like tusks. In this form she has a large amount of strength able to make a large crater in the ground, levitate, and has high resiliance as a direct attack from the Medajalibur could not damage her, but Kamen Rider Birth's Breast Cannon was able to cause some damage as well as release the Kuwagata and Kamakiri Medals she possessed and against OOO in a single colored combo like Gatakiriba, he was able to destroy her.


When Mezool was first created, she resided within the original 10 Core Medals along with the other Greeeds. But as the 10th Core Medal was taken away, Mezool was released from the Core Medals. She and the other Greeeds became the embodiment of greed. The First Kamen Rider OOO shouts "Happy Birthday" and takes their Core Medals.

Mezool joins up with the other Greeeds and agrees to take down the King together, in order to retrieve their Core Medals. The Greeeds manages to get their Core Medals back too, but even when they are in their full form they can’t take on the king. In order to defeat him, they resort to using Yummies created from the King’s greed. Uva, Kazari and Mezool creates the Cockroach YummyLion Yummy and Whale Yummy, they are almost as strong as a full form Greeed because of the King’s strong greed. But none of this is enough as Ankh reveals that he was working with the King all along, but the King betrays Ankh and scans all Core Medals which sealed him and the entire Greeeds along with Ankh's right arm.

In modern times after the Greeed were released, Mezool with the other Greeed began their quest to become Multi King while at the same time get back their Core Medals and gain more Cell Medals through their Yummy. Mezool often keeps the other Greeed in line while fighting the present OOO, Eiji Hino whenever he interferes with her Yummies and had lost two of each of her Tako and Unagi Core Medals during their second fight when OOO assumed Litorartar along with her leg armor with Gamel helping her escape. She has since regained her Tako Medals thanks to Gamel grabbing them when OOO accidentally kicked the Heavy Mammal Greeed into Ankh in their second fight. When the Greeed decided to ambush OOO, Mezool was robbed of all but one of her Core Medals thanks to Kazari, making her revert into her human form, then fled with her Core Medals being used in an experiment on Gamel. When Mezool returned to the Greeed's hideout she was attacked by Uva, no longer having any power or dominance over him or the other Greeed and was chased by Uva's Waste Yummy until they were destroyed by Kamen Rider OOO, unaware of Mezool's human identity. When Gamel was suffering from an energy overload while looking for Mezool, she absorbed him to keep the power from going out of control regaining her complete form. Unfortunately she is overwhelmed by even more power, gained from both a large amount of Cell Medals and two of Uva's Core Medals becoming a Giant Greeed. At first Kamen Rider OOO has a hard time fighting against her until he receives help from Kamen Rider Birth and gains the two insect Core Medals to become Gatakiriba Combo and destroys her Gatakiriba Kick. When her Core Medals were released they were seized by Ankh, Kazari, and Uva.

Later, she has been resurrected along with Gamel by Uva in episode 36. However, after witnessing OOO's Putotyra form, Mezool subsequently betrays Uva and, along with Gamel, sides with Kazari.

Later, after Ankh gives her back her Core Medals to assume her complete form, spurred by Kiyoto Maki knowing it was a facade, Mezool leaves Gamel to achieve her desire by abducting mother/child pairs and sealing them in her Yummy eggs to suck out their love. With her full power, Mezool is able to counter Kamen Rider OOO Latorartar Combo before he uses the Toride Vendor and the Medagabryu to shatter a full set of her Core Medals. Mezool then dies as Gamel arrives in her final moments, with only six of her Core Medals left in existence.

Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max

Foundation X later created a new Greeed based on Mezool's data. Unlike the original one, this Dummy Mezool was only composed by Cell Medals. Alongside the other Dummies, she attacks OOO. However, alongside Fourze, OOO frees the Seven Legendary Riders, who take on the battle against them. This Mezool was destroyed by Riderman's Rope Arm.

Kamen Rider × Super Sentai: Super Hero Taisen

Mezool is resurrected by Doktor G and becomes one of Dai-Shocker's 12 commanders. In the final battle, when Dai-Shocker and Dai-Zangyack unite to face the combined forces of Kamen Rider and Super Sentai, Mezool is last seen being defeated by Red1.

Kamen Rider Wizard

When monsters are killed on Earth, their souls are sealed in the world within the Magic Stone. The Riders gather and attempt to defeat Amadum, who plans to liberate the monsters within the stone. After his troops are defeated, he summons many powerful monsters to stop them. The Mega Greeed can be seen among those. This Mega Greeed is quickly destroyed by the combined attacks of the Denliner, Castle Doran and various Kamen Riders. Neverending Story

Video Game appearances

Kamen Rider Travelers Record

OOO and Birth vs Mezool and Same Yummy Travelers Record

Mezool and the Same Yummy fighting Kamen Riders OOO and Birth as seen in gameplay in Kamen Rider Travelers Record.

Mezool appears in the video game Kamen Rider Travelers Record.

Yummies created



Mezool for most of the series

  • Height: 214 cm
  • Weight: 112 kg

Mezool Complete

Mezool in Completion

  • Height: 214 cm
  • Weight: 112 kg

  • Height: 3,500 cm
  • Weight: 181,437 kg


"Mezool" comes from the Japanese word mezuru (愛ずる? "to love"), which is a reference to her desire and Mezool's Yummy growing from the obsession of the host.


Behind the scenes


Mezool is voiced by Yukana (ゆかな?), as her human form is portrayed by Honoka Miki (未来 穂香 Miki Honoka?).

Her suit actor was Satoshi Fujita (藤田 慧 Fujita Satoshi?).


  • Mezool is the only Greeed (aside from Ankh (Lost)) whose voice actor is different than her human form's actor.
  • Her human form is also the only one with more than one outfit.

External References

"TV Asahi's page on Mezool". [1]

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