Yukio Mashimi

Yukio Mashimi is a friend of Hamato Yoshi.

Biography
During the 60s, Japan was still recovering from its defeat in World War II and it was not uncommon to see orphans begging for food and money. One day, Hamato Yoshi and his friend Yukio Mashimi picked up a five yen that fell from a stout man. The latter was intent on spending it; the former returned it. Seeing such kindness, the old man, known as the Ancient One, told them they could have the coin if they could snatch it from his hand. Mashimi was unsuccessful; Yoshi was. The Ancient One took the two of them in, gave them food, trained them in the ways of ninjitsu and raised them as his own sons. They always did everything together and even fell in love with the same girl, Tang Shen.

While in the city, the two noticed a man being harassed by dishonorable ninja and helped him. But they discover his arm is mechanical. The man, Mortu, offered them the chance to join the Guardians or be left with the strange mystery; they chose the former but the Ancient One disapproved, saying they required mental training. But as men, they made the decision on their own and joined the Guardians. However, Mashimi failed to move up in the ranks as Yoshi became Guardian Prime. Soon, after it became clear that Tang Shen loved Yoshi, something in Mashimi snapped and he murdered her under the rain and then betrayed the Utroms' location to the Shredder. But he did not know about the escape pods and was on thin ice with the Shredder. When Yoshi came to the Shredder's fort to challenge Mashimi, the latter was confident that he would be supported but the Shredder ordered him to fight Yoshi alone. Ultimately, the latter win and Mashimi asks Yoshi to forgive him as he dies.