Ardbert is angry, brash and cynical. Quick to decry the notion of heroes and bemoan his role in dooming his world to a Flood of Light, he acts as a foil to the Warrior of Light and their companions' consistent optimism. Ardbert is good at heart and treasures his companions dearly, expressing anger and frustration at being forced to play the villain during his time on the Source to save his world.

When the Warrior suffers a bout of pain from containing the Light, they and Ardbert make contact and spark a reaction, hinting at a greater connection between the two. A self-aware Amaurotine illusion reveals they can also see Ardbert and recognizes he and the Warrior to be two parts of a sundered soul. When the Warrior is on the brink of corruption from the Light within them while facing Emet-Selch, Ardbert merges his soul into the Warrior so they can contain the Light. With Ardbert speaking through the Warrior, Emet-Selch momentarily sees an Amaurotine, his old friend, in the Warrior's place.