King Youngjonny

King "Big Cap" Youngjonny is a child pirate and of the Cap Pirates. Originating from the ghost-town Rags located on Old Island, Youngjonny is a who underwent experimentation at Playground 003 under the name of Little Boy Blue (リトル・ボーイ・ブルー). He quickly proved himself in his tests and was scheduled to be sold in due time. However, his desires did not match with the intentions of Playground 003's superior, resulting in a bloody battle with the imposer and master which would leave him the victor. Now the ruler of his playground, Youngjonny would develop a crew out of the remaining kids and teenagers to sail the seas with, his goal to become a legend in this era.

Trivia

 * Youngjonny's concept is based off of, the youngest known pirate.