Bound to the Remnant Gae Bolg, the young Marquis has inherited not only the throne of Athlum but also a legacy of great and benevolent rule. As the story begins, his central desire is Athlum's independence from the principality of Celapaleis. His four generals - Torgal, Pagus, Emma, and Blocter - are loyal, devoted comrades who offer support and wise counsel. But the burden of leadership is his alone, and the appearance of Rush Sykes presents him with his greatest challenge.
Throughout the entire game, David aids Rush in his quest to find his sister. By doing this, he is directly involved in the agenda of Wagram, and the Conqueror.
Spoiler warning: This section may contain information that could spoil the story line or displays in depth quest or fight details.
At the end of the game, David is visibly upset and sad about how his and Rush's quest comes to a close. As Rush tells him, his generals (Torgal, Pagus, Emmy and Blocter) and Irina that he refuses to let them die and will instead destroy all Remnants [see The Final Fight], David is rooted in place, in shock, as he holds Irina back from running to Rush.
When Rush disappears along with the Conqueror and all other Remnants, tears fall down his face and he cries out Rush's name seconds after Irina crumples to the ground.
Later, leaving the area with his Four Generals, he has his eyes downcast, before the affects of Rush's sacrfice take affect and his Gae Bolg disapears from over his right eye. David seems to have mixed feelings about this: he is free, but at the cost of a dear friend. He restarts his march, now with his head held high.