Dunan is initially a stereotypically pampered, lazy, cowardly, dull-witted, self-centered, bigoted aristocrat. His attitude towards the lower classes in society ranges from patronising to contemptuous, and he expressed vehemently misogynistic opinions during the Liberl countercoup by the Bracer's Guild and Royal Guard. His behaviour caused much difficulty for his butler Philip Renard, and made him an ideal puppet for Alan Richard.
However, after Estelle Bright rescued him from a second coup attempt by Kanone Almathea, he becomes a more responsible leader. He engaged with the citizens of Grancel to address their concerns during the orbal shutdown caused by the reappearance of the Aureole, and stood against the Ouroboros Enforcers when they invaded Grancel Castle.