A loyal member of the Deliverance, Lukas grew up on the borderlands of Zofia. His older paternal half-brother saw him as a rival, despite being younger, and forced Lukas to enlist in the Deliverance. He eventually becomes a Soldier whose considerable merits have caused him to rise quickly up the ranks. He came to Ram Village to recruit Mycen when Desaix took over Zofia castle. However, Mycen refused his request. Alm then decides to join in place of Mycen. For the majority of the game, he acts as an older brother figure and mentor to Alm.
After Clair is rescued in Chapter 1, Fernand starts browbeating Lukas, who's obviously very uncomfortable while also trying to keep it together, as he is the oldest member of the group and feels the need to act accordingly. Alm cuts in and tells Fernand that he'll take any insults to himself, but he won't stand for any denigration of Lukas, to which he genuinely expresses his gratitude.
After the war, he joined the knighthood of the newly united Kingdom of Valentia and worked towards its restoration, and post-retirement became a public teacher.