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Part of the Mithiril team, assigned to protect Kaname Chidori.
Sousuke Sagara was a war child and was raised in Harmajistan, and many others for some time. He has been fighting since he was 8 years old and was taken in as a mercenary by Mythril. Was an average student with extraordinary test scores while in training along with Kruz Weber. During a battle he took out a group of rebels that raided the training camp and took out their three armslaves (mechs) with his broken AS that had no legs. He was assigned to be an undercover bodyguard for Kaname Chidori, a high school student rumoured to be a whispered. Sousuke is a very uptight person and does not know many social type things. Later he is assigned an A.S. called "Arbalest," which is equipped with a lamda driver, which is a device that can optimize any output and create a barrier controlled by emotion and adrenaline but this is only useable for a limited time. He eliminates many enemy A.S`s and gets a promotion at the end of the first series. In the second series "The Second Raid," he has to more missions and eventually stops most forces from obtaining the whispered. Later in series three, "Full Metal Panic: Fumoffu," he has to obtain a bonta-kun suit to mask his presence to save Kaname from some thugs.
It was between the first and second series of FMP he was assigned to the Arbalest, an AS with the lambda driver. As he was the first one to use the mech, he is now responsible in making full use of it. This seems to be a problem as on a few occasions during battle he cannot start the driver and has nearly cost him his life and endangering his team mates. During the second raid he has been busy on mission and has become more human than being the uptight army specialist.