Darius had tanned skin, short unkempt black hair and small light silver-colored eyes. He wore the typical uniform of a member of the Scout Regiment.
Darius is present when Erwin attempts to recruit the graduates of the 104th Cadet Corps to join the Scouts. When Erwin informs the cadets of the Scouts' high mortality rate, Darius attempts to warn him not to be too blunt, lest none of them join.
As the Scouts are departing on their mission, Darius rallies the recruits with encouraging words.
During the 57th Exterior Scouting Mission, his team comes into contact with the Female Titan. Darius fires a signal flare at the Titan to distract it and give his team time to attack it, but they are each killed in short order. Darius attempts to flee from the village to warn the other Scouts about the mysterious Titan, but the Female Titan catches up and kicks him and the horse into the air, killing them both instantly.
During the Battle of Shiganshina, as Erwin Smith begins to lament the dwindling hopes of his dream, Darius stands among the many fallen Scout Regiment comrades in Erwin's mind, wanting to know if their deaths had meaning.
When Hange decides to oppose Eren's plan to destroy the world beyond the Walls, Darius is one of the soldiers remembered while Hange tries to convince Jean and Mikasa that their fallen comrades would not support destroying the world.