Peko is another member of Team Baron. He is loyal to Kaito, but cheats to help Team Baron win at the Inves Game. He was originally invited by Mai to join Team Gaim, but refused and joined Team Baron because they were the top dance team in history. When the Beat Riders want to clear their names from being framed by the citizens (mainly Oren at Takatora's direction) for summoning the Inves attacks and infecting the citizenry, Peko shows his disapproval of Kaito's refusal to join the Beat Rider All-Team Dance Show, but later goes when Kaito resigns from being Team Baron's leader. Peko, along with Zack, defends the city in the event that Kouta is not available, providing backup to Armored Rider Knuckle. During the Inves invasion throughout the world, Peko, along with Zack and Jonouchi, become angered that Mitsuzane has betrayed them. When Mitsuzane tries to take Mai away from the Armored Rider force, Peko tries to stop him from being reckless. However, Peko is attacked by the Over Lord Shinmugurun, leaving Mai no choice to go with Mitsuzane to spare Peko's life. Once Mitsuzane and Shinmugurun successfully kidnap Mai, a brutally injured Peko attempts to call for help. However, his microphone recording the incident prompts Kouta and Kaito to rush to Peko's aid who attempts to tell them that Mitsuzane caused this, before Kaito stops him and has Chucky stay behind to look after him while Kouta chases Mitsuzane down. After the Over Lord/Femushinmu's race becomes extinct, Peko and Chucky find Mai, who has recently fallen ill because of the Golden Fruit within her. When Mitsuzane arrives as well, Peko still considers Mitsuzane a traitor until Ryoma arrives to take her to a hospital with his and Chucky's aid. However, both are soon betrayed by Mitsuzane and Ryoma by locking them in a room in the hospital, only managing to escape through the window using bedsheets. On their way back, they find Kouta after his fight with Mitsuzane, and believe him to be dead, but he is simply unconscious. After learning that Kaito has become an Over Lord, Zack asks Peko to deliver a message to Oren to take Kaito out. Peko later evacuates the city along with the others under the direction of the JSDF. Three months after Earth is saved, he and his sister Azami visit Zack in the hospital and tell him what has happened as a result of Kaito's death and Kouta's disappearance. Later, he, along with the other Beat Riders, starts a combined dance troupe. Seven months later, while the Beat Riders trying to convince Mitsuzane to come back with them but he declines their offer, Peko reminds his Beat Rider friends about Mitsuzane's past mistakes and he asks them to give him time alone to atone for what he has done.
In Kamen Rider Gaim: Gaiden, after the Movie War: Full Throttle event, he was entrusted by Zack to take care of Team Baron for him, since he was planning to go to New York. Just before Zack's trip, Peko and the other Beat Riders are kidnapped by Shura's Team Neo Baron, forcing Zack to rescue Peko and his friends.
During the events of the film Kamen Rider Gaim: Great Soccer Battle! Golden Fruits Cup!, Peko obtains a Genesis Driver and the Matsubokkuri Energy Lockseed which allows him to transform into Kamen Rider Kurokage Shin Matsubokkuri Energy Arms, armed with the Kagematsu Shin instead of a Sonic Arrow.
Peko is portrayed by Saku Momose.