O Medals

, commonly referred to as simply , are the special coin-like, collectible devices featured in Kamen Rider OOO. 
There are two different types of O Medals:
*
*
==History==
Five types of 50 (five sets of 10) models were created by human alchemists 800 years ago as a means to create artificial life, drawing from characteristics of different animals. One medal from each set was taken in order to create a "desire" in the other nine, which ultimately manifested their own consciousness, creating the Greeed. 
In modern times, a sixth set known as the Purple Core Medals were created from the antithesis of desire. In the near future, state-of-the-art technology was used to created the Super Core Medals, which seemingly surpass previous Core Medals in power. It is also notable that Foundation X somehow managed to turn Kamen Riders themselves into Core Medals.
In the series finale, only 53 Core Medals remained after Eiji and Maki permanently killed several of the Greeed. However, all Core Medals except for one Core were thought to be destroyed when Eiji was able to defeat the Kyouryu Greeed, with the Greeed absorbing all but one of the Core Medals, along with the Core Sarcophagus Uncontrollable. The influx of power caused a black hole-like collapse of the Purple Core Medals' power, with seven of the Purple Cores seen shattering as they approached the event horizon, disappearing forever. That one Core Medal that was left was the half-split Taka Medal which formerly contained Ankh's consciousness, with Eiji now carrying it with him on his journey while finding a way to fix the medal and revive him. However, in the events of Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max, it was eventually revealed that the black hole was not a gateway to destruction, but a time portal, which had sent all of the Core Medals, as well as the Cell Medals, to where the Core Sarcophagus Uncontrollable had gathered, including what could possibly be the remains of the Kyouryu Greeed's consciousness, 40 years into the future. There, they merged into the body of Michal Minato. The overwhelming amount of Cell Medals and Core Medals allowed the newly created medals of Kamen Rider Poseidon to form into a Greeed with a will all of its own.
There were also the , which were originally part of the Core Medal sets that were composed from Ankh, Kazari, and Uva's. Being the only tenth Core Medal separated from the rest of their respective sets instead of being destroyed, the King used them to become Kamen Rider OOO eight centuries ago. They were originally in Kougami's possession until he gives them to Eiji to become the true Kamen Rider OOO. These special Cores were first mentioned in a Foundation X report during the antepenultimate episode of Kamen Rider W, referred to as the King Medal (at the time, it was believed there was only one King Core) which are said to have more power than even the True Gaia Memory. However, prior to the final battle, the King's Core Medals shattered due to the power of the purple Core Medals and the massive amount of Cell Medals in Eiji's body.
After Mega Max, Eiji now has one copy of each Core Medal of the five desire-based Medals. However, the events of had shown that Eiji has regained the Purple Cores, with only seven of the Core Medals being explicitly been shown destroyed in the finale and was never seen/used in Mega Max. Also, Eiji was seen to have two more copies of the Taka, Tora, and Batta Medals to allow Gokai Red, Yellow, and Green to assume his Tajadol, Latorartar, and Gatakiriba Full Combo forms. In Ultimatum, Eiji uses the orange Core Medals, bringing his total count of Medals to 28.
The O Medals, along with the other Rider Powers, were stolen from OOO by Amadum in the world within the Magic Stone, who explained that they were already his due to the Riders' powers being from the same source as evil. However, the power was soon returned thanks to the appearance of Kamen Rider Gaim, with the return of the Medals immediately transforming OOO into Super Tatoba Combo. 
For some reason, when Eiji reappears again in Kamen Rider Heisei Generations Final: Build & Ex-Aid with Legend Riders, he does not have any of his Core Medals with him, and has to rely on Foundation X's artificial Core Medals to transform. He similarly requires artificial Core Medals made from the Zeus Dopant’s Core Energy to transform during the events of KAMEN RIDER: memory of heroez.
==Core Medals==
===Overview===
 are multi-colored O Medals which allows Kamen Rider OOO to transform into any combination of his various forms. 
Each set of Core Medals comes in a specific color and animal type. Red Core Medals have bird powers; yellow Core Medals have big cat powers; green Core Medals have insect powers; silver Core Medals have heavy mammal powers; blue Core Medals have marine animal powers; purple Core Medals have dinosaur powers; and orange Core Medals have reptilian powers. There are 70 Core Medals total from the series, each three from a Greeed divided in three groupings for the use of OOO: Head, Arms (Torso), and Legs. They have either one, two, or three horizontal bars on their backs, respectively, to indicate which corresponding OOO Driver slot they are compatible with.
===Design===
A Core Medal consists of the following parts:
* - A special type of ore that the Core Medal is composed of. Its name is derived from the which symbolizes 'infinity'. Although it is an ore mixed with some trace minerals, the acquisition route at that time was not recorded, and the existence of a vein has not been reported in modern times, making it a phantom ore. It is said to originally be a colorless and transparent ore, but the hue has changed slightly.
* - The animal engraving. It is a relief-like design that correspond to the power hidden within the Ouroborosolite. that Since no traces of artificial processing can be seen, it is speculated that it may be due to the characteristics of Ouroborosolite itself rather than due to human hands.
* - The golden ring. It is a protective ring that protects Ouroborosolite from erosion and physical destruction.
* - The line engravings on the outer surface of the Gold Circlet. It is a kind of shock absorption mechanism that prevents the Golden Circelt and the Ouroborosolite from being destroyed by the repulsive force of the Core Medal's enclosed power.
* - Two stones on the top and bottom of the Medal. They are emergency power outlets for the power enclosed in a Medal. In the event of a runaway of power that cannot be absorbed by the Crown Ornament, it plays the role of a safety valve to diffuse energy and radiate it outside. (In the DX toys, the Rivet Stones are the screws holding a Core Medal together.)
* - Lines engraved at the back of the Core Medal. There are various Superior Faces on the surfaces of Core Medals, but one to three line reliefs are engraved in the center at the back. (In the DX toys, the Turnface Signs are stripes that correspond a Medal to a respective slot on the OOO Driver.)
===List===
==Cell Medals==
===Overview===
 are silver O Medals and come from the Greeed, making up their bodies and those of the Yummy. Cell Medals can feature the front side of any Core Medal (including from the special black, purple, and orange sets), usually one from the Greeed who produced it but with no needed correlation once Yummies start accumulating them; their backs feature an X, though some shots show them as having the same horizontal bars as Core Medals. These Medals are a manifestation of human desire that hold tremendous power, and can be generated by Yummies absorbing targets of human desire. While the Greeed were sealed away, the Kougami Foundation studied and gathered the Cell Medals, incorporating them in their Ridevendor, Medajaribur, and Candroid technology.
Whereas Core Medals can be used and reused without effect done on the Medals, Cell Medals only have a limited amount of energy and vanish when the energy has been depleted, usually after one use. Also unlike Cores, which can only be completely destroyed, Cell Medals can be broken, as demonstrated by Uva and Poseidon's shattering of Cell Medals to make Kuzu Yummies.
Unlike Kamen Rider OOO, who uses Core Medals, Birth uses these Cell Medals to transform, access weapons, or power a Cell Burst finisher. No specific Cell Medal is required for Kamen Rider Birth to do any particular task (though oddly, Sasori Cell Medals from the Black Medal set otherwise exclusive to Movie War Core are commonly seen being used by him to transform, even featuring in his spot in the opening theme). He also fires Cell Medals from the Birth Buster for stinging effect against Yummies.
===Design===
A Cell Medal consists of the following parts:
* - A metal that the Cell Medal is composed of. It is a type of special shape memory metal called . Although it cannot store as much energy as Ouroborosolite, it has an excellent balance of energy storage rate and strength, and most of the Cell Medals are made of this metal.
* - The animal engraving. Due to the characteristics of Spirit Silver, the design of living things corresponding to the Medal's hidden power appears in the relief.
* - The engravings on the side of the Cell Medal. It is a kind of shock absorption mechanism that prevents the Spirit Silver from being destroyed by the repulsive force of the Cell Medal's enclosed power.
* - A 'χ' shaped relief common to all Cell Medals is engraved on the back.
===List of Cell Medals===
KRO-Taka Cell Medal.png|Taka Cell Medal
KRO-Kujaku Cell Medal.png|Kujaku Cell Medal
KRO-Condor Cell Medal.png|Condor Cell Medal
KRO-Kuwagata Cell Medal.png|Kuwagata Cell Medal
KRO-Kamakiri Cell Medal.png|Kamakiri Cell Medal
KRO-Batta Cell Medal.png|Batta Cell Medal
KRO-Lion Cell Medal.png|Lion Cell Medal
KRO-Tora Cell Medal.png|Tora Cell Medal
KRO-Cheetah Cell Medal.png|Cheetah Cell Medal
KRO-Sai Cell Medal.png|Sai Cell Medal
KRO-Gorilla Cell Medal.png|Gorilla Cell Medal
KRO-Zou Cell Medal.png|Zou Cell Medal
KRO-Shachi Cell Medal.png|Shachi Cell Medal
KRO-Denkiunagi Cell Medal.png|Denkiunagi Cell Medal
KRO-Tako Cell Medal.png|Tako Cell Medal
KRO-Ptera Cell Medal.png|Ptera Cell Medal
KRO-Tricera Cell Medal.png|Tricera Cell Medal
KRO-Tyranno Cell Medal.png|Tyranno Cell Medal
KRO-Cobra Cell Medal.png|Cobra Cell Medal
KRO-Kame Cell Medal.png|Kame Cell Medal
KRO-Wani Cell Medal.png|Wani Cell Medal
KRO-Ebi Cell Medal.png|Ebi Cell Medal
KRO-Kani Cell Medal.png|Kani Cell Medal
KRO-Sasori Cell Medal.png|Sasori Cell Medal
==Rider Medals==
The are a new type of O Medal independent from Core and Cell Medals. They allow Kamen Rider OOO to transform into the Kamen Riders based on those Medals and perform their finisher attacks. Many of these Medals sport different colors, with sporting the main Rider's emblem to show which series they hail from.
==Notes==
*In the series, the Core Medals uses two different series of props, with one being based on the DX toys and another that is larger for use by suit actors.
**The toy-based prop does not contain the chip that can usually be seen through the medal's plastic, while the larger props feature an opaque surface and fully enclosed gold edge.
*The Core Medals are the only Heisei Phase 2 collectibles whose final form item (the purple medals) are not physically different from the standard items that came before. 
**The purple medals are also the only final form collectibles in the Phase 2 Heisei Era to be composed of multiple pieces rather than a singular item.
*Out of the 5 future medal sets, only 3 have been used by riders other than OOO.
**The Saramiuo Medals were used by Kamen Rider Poseidon in Movie War Mega Max.
**The Bikaso Medals were used by Kamen Rider Birth to access his Birth X form.
**Although the actual Mukachiri Medals were not used, a similar set of medals with the same motif, the Goda Medals, were used by Goda to transform into Kamen Rider Goda.
* The Shocker Medal, the Super Core Medals and the Goda Medals are movie form medals whose Superior Face and Rivet Stones have a gold coloration.
==Navigation==
Category:Kamen Rider OOO
Category:Rider Powers
Category:Collectible Devices
Category:Arsenal (OOO)
Category:Transformation Gear