Duke Dusse, Rachel's maternal uncle, reappears after a long absence to intervene in her life. He orchestrates her removal from the convent and installs her in his castle, citing familial obligation. His undisclosed objective is training Rachel as a "Love Doll"—a high-class escort or sex slave for wealthy and powerful individuals' gratification. He takes pride in this specialized training as his domain of expertise.

A dark secret concerning his relationship with Rachel's deceased mother shadows his motivations. This secret is later revealed to involve brother-sister incest, indicating a troubled familial history directly impacting his actions toward Rachel. Upon assuming custody, he initiates a harsh conditioning phase intended to shape her into the compliant role he envisions.

His character demonstrates a focus on control and the systematic transformation of Rachel for exploitation, leveraging his position as both relative and authority figure.