Shane McDougal

Shane McDougal is the younger twin brother of Kane McDougal and a member of the Parabellum's crew. Shane is identical to his older twin with green eyes and light brown hair in the same style. One difference between them is that Shane has a small tuft of hair that frequently flips upward. Though he displays the same calm and friendly personality as Kane while impersonating him, Shane also appears to display this personality outside of impersonation. He also appears to display a hint of self-praise. At some point, Ironbeard had Shane switch places with Kane in order to learn how the Bentenmaru was getting on under its new captain.

It isn't stated at which point they started switching but it is likely that they began at the time the yacht club decided to enter the Nebula Cup. (Source: Mouretsu Pirates Wikia)