Boss

"Boss" was the nickname of an elite clone commando who was part of Delta Squad during Season 6, the fruit of many years of research as the perfect warriors under Delta that even the Three Kings are trying to replicate, serving with commandos Fixer, Sev, and Scorch.

Episode 13
Along with his team, he takes Tatsuya's place in the fight against The Circus with the rest of his squad to protect him under Delta's orders.