Zeronos Cards

are a transformation card item used by Yuto Sakurai, also known as Kamen Rider Zeronos. These cards allow him to access his different forms. Unlike the Rider Pass, each Zeronos Card has a limited number of times it can be used. Once a Zeronos Card's energy is depleted, it dissolves upon removal from the belt.
== Overview ==
The Zeronos Cards are made from the memories of the older Yuto's existence. As a result, when a Zeronos card is used up, an individual who knew the older Yuto will lose those memories, forgetting him entirely. Thus, if they're completely exhausted, Yuto risks ceasing to exist in the minds of people who are not Singularity Points. He later receives a set of red Zeronos Cards from his future that use other people's memories of his younger self to change into Zero Form. These cards rust away into nothing after being used up, and cause people to lose any memory related to the younger Yuto.
Although the Zeronos cards are used up at the end of the series, with his older self disappearing entirely, Yuto is shown regaining the ability to transform into Kamen Rider Zeronos in guest appearances, somehow replenishing a new set of cards. How this is possible is never explained, with Yuto curiously remaining unaffected after each transformation. 
In Kamen Rider Den-O: I'm Born!, Yuto demonstrated that Zeronos cards can be used in place of a Rider Pass to traverse time by inserting them into the Rider Pass slot of his Machine ZeroHorn.
==Notes==
*Both green and red Zeronos cards have an identical yellow opposite side. With green cards, Yuto is able to use the yellow side to transform into Kamen Rider Zeronos Vega Form. It was never shown what might possibly happen if the yellow side of a red card was used however.
**A Zeronos Card with a green side and a red side was never shown in the series, but one such card comes as part of the CSM Zeronos Driver set, alongside a green/yellow and a red/yellow card.
==External Links==
*Kamen Rider Zukan page on Zeronos Cards.
*Kamen Rider Zukan page on Zeronos Card (Red).
==Navigation==
Category:Kamen Rider Den-O
Category:Transformation Gear
Category:Collectible Devices
Category:Arsenal (Den-O)
Category:Rider Powers
Category:Card devices