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 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 person. Actions that support his humility are engaging with the Grancel citizens to address their concerns during the orbal shutdown caused by the Aureole's reappearance, and stood against the Ouroboros Enforcers when they invaded Grancel Castle.