Fenn Shysa was a male Human Mandalorian, born on the planet Mandalore in the years prior to the Clone Wars. Alongside his childhood friend, Tobbi Dala, Shysa joined the two-hundred twelve-man force known as the Mandalorian Protectors, under Spar—"Mandalore the Resurrector." He would fight for the Confederacy of Independent Systems during the Clone Wars and, along with Dala and Spar, survive as one of only three Protectors to remain following a disastrous battle on the planet Norval II.
Shysa, Dala and Spar returned to Mandalore, where they would remain until the war's end, living to see the Galactic Empire rise to take the place of the Republic. In the face of an Imperial occupation of his homeworld, Shysa adopted the mantle of the new Mand'alor—leader of the Mandalorian clans— and forged a guerrilla resistance to drive the Empire, with its slaving and mining operations, off of Mandalore. After many years of fighting, the Mandalorians finally triumphed against the Imperials when Dala sacrificed himself to eliminate the Suprema, the Imperial commander.
Although his world was finally free from Imperials, Shysa continued to take the fight to the Empire. He reformed the Mandalorian Protectors and led them into battle alongside the Alliance of Free Planets during the Nagai–Tof War. Shysa's men played a pivotal role in the Second Battle of Endor, repelling Nagai forces personally led by the Dark Lady Lumiya. Following the end of the conflict and the joining of the Nagai with the Alliance of Free Planets, Shysa traveled to Nagi to liberate the world from the Tof. After a long and distinguished career, including a presence at the Battle of Mindor, Shysa perished on the planet Shogun, saving Boba Fett from death. In his final moments, Shysa would implore Fett to take up the position of Mandalore after his death, a request that Fett would honor.