The Mantis Yummy is created by Uva via a Kamakiri Cell Medal, formed from a woman's desire to have a particular necklace in a jewelry store, resulting in the White Yummy eating all of the jewelry in the store before assuming his current form. The power he gets from the Cell Medal enables him to form several scythe-like energy projectiles to attack with. Uva tasks him with finding Ankh and retrieving the Greeed's stolen Core Medals. While he locates him and overpowers the incomplete Greeed with ease, Eiji intervenes and prevents him from finishing Ankh off. In return, Ankh grants Eiji the ability to become Kamen Rider OOO and fight back. During the ensuing fight against Tatoba Combo, Ankh gives Kamen Rider OOO the Kamakiri Core Medal and to transform into Takakiriba. In this new form, Kamen Rider OOO destroys the Mantis Yummy with his Kamakiri Swords.
Leaf-Rolling Weevil
The Leaf-Rolling Weevil Yummy is created by Uva via a Cell Medal on one of the thieves who attempted to rob the Kougami Art Museum blind. As his host's desire is money, the White Yummy attacks a bank and begins to eat all of the money it can find. Upon devouring enough, it molts into the monstrous Leaf-Rolling Weevil Yummy which begins to grow very large and demolishes a building, as a result of Ankh wishing to allow it to grow stronger to provide more Cell Medals. Kamen Rider OOO is initially unable to defeat the Yummy until he receives several Cell Medals, a Ride Vendor motorcycle, and the Medajaribur sword from Shintaro Goto representing the Kougami Foundation. By performing a Triple Scanning Charge OOO Bash, Kamen Rider OOO destroys the Leaf-Rolling Weevil Yummy.
The Cat Yummy is created by Kazari by using a Cell Medal on the gluttonous Monta Fukuji. With a parasitic White Yummy having him submit to his gluttony, Monta consumes food voraciously. When Eiji fights Monta, he holds back because he is still human. However, the White Yummy emerges from Monta and transforms into the Cat Yummy, whose fat made him immune to cutting attacks. However, Kamen Rider OOO changes tactics and uses blunt attacks to weaken the Cat Yummy before attempting to use the Tatoba Kick to finish him, only to be saved by Kazari. Going back into Monta's body, the Yummy force feeds him to become complete while consuming the human from the inside out. However, assuming Takatorartar, Kamen Rider OOO manages to use his newfound high-speed kicks to keep the Yummy's wound open long enough to pull Monta out, allowing Kamen Rider OOO to use a Triple Scanning Charge OOO Bash attack to destroy the Yummy.
The Piranha Yummy are created by Mezool by using a Cell Medal on the shopaholic Haruka Yamano, one of Hina Izumi's classmates in fashion college. Hatching from their egg-like form, the vast number of Piranha Yummy are countered by Kamen Rider OOO assuming Gatakiriba Combo to even the odds before the Yummy gather into a larger form that he destroys from the inside out with the Gatakiriba Kick. Another batch of Piranha Yummy are later created from a con artist while Eiji and Ankh with preoccupied with the Siamese Cat Yummy and Uva's Waste Yummy, succeeding in their purpose before being fed on by the Greeed.
The Bison Yummy is a Yummy created by Gamel from a Cell Medal born from Gamel's own desire to be amused of human suffering after witnessing a fight between married couple Takeshi Komori and Momoko Komori. He has immense brute strength, pounding the ground with his fist to create a shock wave that lifts objects into the air to throw them at people. Later, after being overwhelmed by Kamen Rider OOO Latoraba, the Bison Yummy acts on his own to punish Kamen Rider OOO for temporarily blinding his master, attacking to attract the Kamen Rider's attention. However, the Bison Yummy is blinded by Kamen Rider OOO Lakiriba before being destroyed, with only a single Cell Medal remaining of him.
The Shark Yummy are created by Mezool after she uses a Cell Medal on the mad bomber Toru Tadano, a worker at the Kougami Biotech Laboratory. Hatching one by one in response to Tadano's actions, a Shark Yummy gathers enough Cell Medals before making his way to the Greeed to be devoured by them. The first Shark Yummy lives long enough to be fed on by the Greeed while the second is destroyed by Kamen Rider OOO Latorartar Combo's Gush Cross Scanning Charge. But when Tadano creates multiple explosives to lace across an amusement park, the remaining Shark Yummy eggs hatch and attack the scientists. But as Tadano is arrested while his bombs were all disarmed in time, the group of Yummy are all destroyed by Kamen Rider OOO Latorartar Combo using the Toride Vendor against them.
The Swallowtail Yummy is created by Uva after he uses a Cell Medal on Keisuke Tsukuba, a blogger who wishes to become famous. The Swallowtail Yummy uses his proboscis to suck the talent out of humans, then transfers the stolen talent via pollen into Tsukuba. In the end, the Swallowtail Yummy is defeated by the Kamen Rider OOO in his Sagohzo Combo with the Sagohzo Impact Scanning Charge.
Siamese Cat
The Siamese Cat Yummy is a female Siamese Cat Yummy, with scalpel-like claws and Cell Medal-like objects hanging from her body, created by Kazari after he uses a Cell Medal on a female doctor named Kei Tamura a genius surgeon who feels the director of the hospital, her father, is holding her back due to her pride and lack of fear for the patients' well being. As a result, the Yummy uses Tamura to perform unauthorized surgeries by herself, giving her father a heart attack in the process. Eventually getting Tamura out of the hospital, Kamen Rider OOO fights the Siamese Cat Yummy, almost destroying her as Sagohzo Combo before the Yummy retreats back into Tamura and escapes. By the time Eiji finds her, Tamura is consumed by the Siamese Cat Yummy as he uses Takatoratar to free her. As Tamura manages to discard her pride to save her father, the Siamese Cat Yummy is destroyed by Kamen Rider OOO using the OOO Bash on her.
The Tortoise Yummy is created by Gamel to defeat Kamen Rider OOO to gain Mezool's approval, tricked into doing so by Kazari. While slow, the Tortoise Yummy can withdraw his arms into his body to spin extremely fast. Though the Yummy overpowers Kamen Rider OOO in both his Sagohzo and Latoratar Combos, keeping him from pursing Kazari when he spirits Gamel off, the Tortoise Yummy is knocked on his back by Shintaro's bazooka and left defenseless as Kamen Rider OOO uses the OOO Bash while in Tatoba Combo to destroy him.
Rhino Beetle
The Rhino Beetle Yummy is created by Uva from a girl named Rie Shiratori, feeding on her supposed desire to become stronger. To that end, while achieving his complete form, the Rhino Beetle Yummy targets Rei's Kendo classmates before Eiji fights him as Kamen Rider OOO Takagoriba to counter the Yummy's hard-armored body. However, during the fight the Rhino Beetle Yummy creates the Stag Beetle Yummy from its body in response to Rei's growing desires. With the Stag Beetle Yummy's support, the Rhino Beetle Yummy overwhelms Kamen Rider OOO and Ankh until Kamen Rider Birth appears and evens the odds, the two Riders ultimately destroying the Rhino Beetle Yummy with a Cell Burst attack and Tatoba Kick combo attack.
Stag Beetle
The Stag Beetle Yummy appears from the Rhino Beetle Yummy's body during his fight with Kamen Rider OOO due to Rei's true desire to get rid of her kendo teacher's pride after becoming strong enough to get the job done. Other than having body armor like the Rhino Beetle Yummy, the Stag Beetle Yummy can create lightning. Both Yummy overpower Kamen Rider OOO until Kamen Rider Birth arrives to even the odds. While Kamen Riders Birth and OOO destroy the Rhino Beetle Yummy, the Stag Beetle Yummy manages to escape and proceeds to make his way to the chapel to kill the bride. But slowed now by Rie, the Stag Beetle Yummy ends up fighting the Kamen Riders with Uva before Kamen Rider Birth quadruples the Cell Burst in his Breast Cannon to completely obliterate the Yummy.
The Lion-Jellyfish Yummy is a new type of Yummy created by Kazari by using the desires of Toichi Yamagane, a criminal who broke out of jail to get his revenge on Shingo for arresting him and his ex-partner Yasuji Okumura for turning him in for a lighter sentence. Unlike Kazari's previous creations, the Lion-Jellyfish Yummy is a lion Yummy augmented with jellyfish features as Kazari had increased his power upon absorbing a Combo set of Mezool's Core Medals into his body. Other than the ability to emit intense light and intense heat, the Lion-Jellyfish Yummy can also spawn small Kurage Yummy from his Cell Medals that self-replicate upon being attacked. He is eventually destroyed by Kamen Rider OOO Tajadol Combo.
The Grasshopper Yummy is created by Uva by using the desires of Susumu Kanbayashi, a father with a sense of justice who attended law school and failed to pass the board exam as a prosecutor. As a result, the Grasshopper Yummy develops a warped hero mentality and attacks anyone who Susumu considers evil, attacking Kamen Riders OOO and Birth when they interfere. Managing to evade Kamen Rider OOO Takajaba's Giga Scan due to Susumu's dependence, the Grasshopper Yummy continues his attack on untouchable criminals as Susumu begins to see realize too late that his desire for justice is making him as much of a monster as those he wants to take down. After talking Susumu to not to rely on justice but instead on protecting those dear to him, Eiji becomes Kamen Rider OOO Tajadol Combo and uses his Giga Scan to incinerate the Grasshopper Yummy.
Series:  Kamen Rider OOO