Shapool

Shapool (シャプール Shapuru) is an adopted heir of a foreign country in South Asia who visits Zawame City as part of an inspection. He is physically identical to Kaito Kumon.

History
While Shapool is watching Kaito's previous battle in a Beat Riders Hotline and trying to imitate Kaito, he tells Alfred to go to Charmant but he refuses and orders him to go with him in an inspection at Zawame. However, Shapool runs away. Eager for some freedom, Shapool finds Kaito, sedates him, and steals his clothes. He then appears before the Team Baron, Kouta and Mai, posing as Kaito. However, Kouta found it weird seeing "Kaito" smile genuinely. Even Shapool also bakes a cake to taste for himself, Mai and Jonouchi. However Oren suspects around Shapool while calling him "Monsieur Banane", which actually mistakens as Kaito and he transforms into Bravo in an attempt to battle Shapool. However, his identity is exposed when he tried putting on Kaito's Sengoku Driver, but was unable to due to Kaito's DNA being locked to the belt, until Zack arrives to pacify Bravo as Shapool and Mai escapes.

Confused, Mai questions if he's really Kaito until the real Kaito (in Shapool's clothes) shows up and drags him into an abandoned place. After they change their clothes, Kaito tells Shapool that Alfred is trying to murder him, and believes that his father might also as well. However Alfred and his guards quickly arrives and finds Shapool there, revealing they are doing this for their own personal gain by taking over Shapool's organization by lying to his father for his "accidental death", and he's taken hostage until Kaito saves him from Alfred who transformed into Kamen Rider Tyrant. After running away from Alfred, Kaito tells Shapool about his worst childhood past in which saddens Shapool. Also Shapool reveals to Kaito that he's actually adopted. When an injured Peko shows up to tell Kaito about Zack and his team being attacked by Kamen Rider Tyrant, with Zack himself being held a hostage, so Alfred can force Kaito to bring Shapool or Zack will be killed if Kaito doesn't do so. Thus, Kaito tells Shapool to stay and guard him.

After Alfred's demise, Shapool writes a letter to thank Kaito for saving him from Alfred's threats and taking what Kaito has taught him, to believe in himself, his friends and to fight for what is right, before he leaves Zawame City to reunite with his father.