Akira Isaki, also known as Switchblade, is a member of the Japanese Blood Brotherhood, working in the U.S. Marines.
Akira Isaki was born in the United States, and his parents were killed in a car crash when he was young, leaving him to be raised by his grandparents. However his grandparents, who had been imprisoned in a torture camp during World War II and felt bitter about Japan's ensuing humilation, taught Akira to be hateful towards the rest of the world, setting himself a duty to restore Japan's honour.
In order to do his part, Akira joined the United States Marine Corps, gaining the call-sign Switchblade. He eventually requested a transfer to the Commander-in-Chief's In Extremis Force (CIEF), who were heading up the Machine restoration mission.
During the CIEF's search for the Neetha, the Brotherhood got in contact with Switchblade and gave him leave to sabotage Wolf's efforts to lay the second Pillar.
After the CIEF had made their way through the traps of the second Vertex, Wolf sent Switchblade and Broadsword to lay the Pillar at the inverted pyramid. Before Broadsword could set the Pillar in place, Switchblade slit the Delta operator's throat and shouted to Wolf his nation's dishonour would be avenged as he prepared to drop the Pillar into the abyss below. However, Jack swung out to the pyramid's tip on a Maghook, grabbed the Pillar as Switchblade let it go and placed it just in time.
Furious and with no way out, Switchblade decided to take one of his organisation's enemies with him, and allowed himself and Jack to fall into the abyss, appearing to all those witnessing that they were falling to their deaths.
As they fell, Switchblade gloated that despite his failiure they would die together, however Jack wasn't finished, and took Switchblade's Maghook and fired it into the abyss wall, stopping his fall. Switchblade was horrified that he had been completely beaten and that he had died for nothing, and continued falling to his death.