Kôji Katô

The StrawHat crew salvage a treasure chest from a sinking wreckage during a raging storm, but it turns out to be an old lady hiding inside it. To get the Straw Hat Pirates to take her home, she promises them the treasure of a golden crown on her island, Mecha Island. The island is impossible to get to by Log Pose. So instead they got there by Kame Pose. Which contain a small turtle pointing to the island... (imdb)

Kurosaki Tomohisa Yamashita is a swindler who cooly deceives other swindlers who have evil intentions. The swindlers who deceive others with words are the "shirosagi" (White Swindler). The swindlers who play with people's feelings are "akasagi (Red Swindler)". And the one who only aims to take large sums of money from shirosagi and akasagi is Kurosaki aka Kurosagi (Black Swindler). (asianmediawiki.com)

Three young men are living the good life as carefree but dirt poor bachelors when one day a young boy suddenly shows up at their door with a note reading "Take this kid in." They also find a mystery pile of money which they promptly squander, money meant for the hid's upkeep so they decide they have to care for him. Where did he come from? Are one of the three his father? Will his mother ever come back? Whatever the answers, they now have their hands full with their new charge. (imdb)

Kurosaki, aka Kurosagi, is a swindler who cheats other professional con artists to help their victims and avenge the death of his own family. Kurosaki buys information about other swindlers from the man who cheated his family, Katsuragi Toshio (imdb)