Carl traveled through the Naruto World and became a ninja during the Sengoku Era. He awakened his golden finger and obtained the inheritance of the strengthened version of Monchi D. Karp.
He was not restricted by age, and the older he got, the stronger he became.
He had once used his pair of iron fists to suppress the Thousand Hands and Uchiha brothers.
He had ended the Warring States Period and was hailed as the hero of the Ninja Realm by the world. He was ranked first among the Three Heroes of the Warring States Period.
In the end, he chose to live in seclusion in the back mountain of Muye because he had defeated all ninjas and samurai, and there was no one to resist him. He became an old ninja that was unknown to the world.
When the third Ninja World War broke out, White Tooth committed suicide, Three Ninja was trapped in Earth Nation, and Muye was in danger. Under the request of F4, led by Flying Ape and Sun Behead, the Ninja World Hero... came out again!