Shirataki Tsuyoki (白の強度, Tsuyoki Shirataki) is the Ship Wright of the Banshee Pirates and their muscle power. He was originally a leader of a group of bandits that would constantly attack port towns from the mountains. He then turned to piracy when it reaches it height, since bandits were one in a few. He then turned his own gang into a crew, stealing a ship and supplies he set out to become the king of the pirates.