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Official Site: Bandai

is a fictional power suit and character designation for one of the protagonists of the 2010-2011 Kamen Rider Series Kamen Rider OOO. The Kamen Rider Birth suit debuts in the film Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core.

During the film Movie War Core, the character Nobunaga (portrayed by Kengo Ohkuchi) transforms into Kamen Rider Birth in one scene of the movie. Eiji Hino also temporarily uses the Birth system in Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals. Erika Satonaka uses the Birth system for a short while in the Kamen Rider OOO Allstars: The 21 Leading Actors and Core Medals net movie.

is a Combat medic (with friends in the medical underground) who traveled the world to help people, meeting Eiji at one time. During that time, Date was shot in the head, though miraculously surviving the incident with the Automatic Colt Pistol bullet stuck in his brain at the back of his head, occasionally causing him pain. Returning to Japan, Date takes a job in the Kougami Foundation as the first regular user of the Kamen Rider Birth system. As Kamen Rider Birth, Date gives himself a task to earn ¥100 million in order to afford the underground surgery that will remove the bullet, tending to say before fighting while gathering every Cell Medal into a milk tank he carries around. Date is a people person, admitting his own desire, but making it a personal rule to not use others to reach his goal and not doing anything that will make himself cry. Date also hates reading manuals and has a tendency to mispronounce names. He enjoys getting the job done perfectly and believes in risking big to win big, though he has few personal interests in fighting the Greeed and Yummy. Date is also known to love eating oden, even making it in Maki's research lab, where he has taken up residence and regularly makes a mess out of, much to the scientist's dismay. When he sees Eiji's picture in the Cous Coussier, he recognizes him as they had crossed paths in the past, though he could not initially remember straight away, while Eiji never knew Date was anywhere around him back then. Date is also training Shintaro Goto to take up the mantle of Kamen Rider Birth once he reaches his ¥100 million goal. Date's medical condition is then revealed to Shintaro after it begins to worsen to where it affects him in in battle. Maki then bribed Date to betray Kougami and join his side, which Date accepted as he starts supporting the Greeed, with ¥50 million up front. But in reality, Date faked the betrayal under orders from Kougami to stop Maki from becoming a Greeed. When the Greeed injure Date in retaliation, knocking him unconscious, it gave Goto the motivation to use the Birth Driver and avenge Date's "death". Though it turned out that he was in no mortal danger from the Greeed's attack, Date decides to let Goto become the new Kamen Rider Birth. He uses the danger policy he signed with the Kougami Foundation to collect ¥50 million, making a full ¥100 million, and thus able to travel abroad to have surgery done to remove the bullet from his brain. Date later returns to Japan, now using the Kamen Rider Birth Proto Type suit to fight the Greeed. After the end of the Greeed conflict, Date returns to being a traveling medic.

is a former police officer who now works for the Kougami Foundation to "Protect the world". He leads the Foundation's Ride Vendor 1st Squad motorcycle brigade and carries a handgun, a shotgun, and a rocket launcher to fight off Greeed and their Yummy. As a result of his battle experience with the Greeed that took out his men, Shintaro becomes the Kougami Foundation's representative to Eiji, even though he feels that Kougami should not rely on him and Ankh, harboring animosity towards the duo and only helping them for the world's sake. However, he warms up to Eiji later and becomes Eiji's ally after taking his words regarding taking action to heart, respecting and recognizing him for his unusual yet commendable qualities. He was interested in Doctor Maki's proposal for an alternate way for normal humans to use the power of Medals, but loses his chance to become the user of the Birth suit due to his refusal to cooperate with Doctor Maki's unscrupulous ways. After meeting its user Akira Date, Kousei Kougami tells him that his pride got in the way of being chosen. To work on his pride, he takes up a job at the as a waiter and custodian. His newfound humility catches Date's attention, and Date decides to start training Goto to be his replacement. Goto was given the original Birth Buster to use and has since been acting as Date's sidekick in battle. Eventually, Shintaro succeeds Date in becoming the second Kamen Rider Birth, carrying his Cell Medal ammo in a backpack and a Cell Medal preloaded into a wristband. He is more adept in using the CLAWS system as unlike Date, he actually studied the user manual and knows the rider system in and out, evident from him using the Cutter Wing, Drill Arm and Caterpillar Leg all at once, and later accessing the Birth Day mode on his very first-time transforming. After the end of the Greeed conflict, Shintaro resumes being a police officer.

Kamen Rider Birth has not been a contender in any CBUB matches.