Giselle Berthier, occasionally documented as Belltye, pilots the Federation spaceship Victoire. She serves under Captain Elene Gregor, her commander since their shared time at military academy. This shared history fosters deep mutual trust and familiarity, allowing Giselle a notably casual and unreserved demeanor around Elene. She consistently interacts informally, bypassing protocols like knocking before entering the captain's quarters, reflecting her straightforward personality.

Giselle possesses distinctive pink hair and violet eyes. Renowned for her piloting skill, particularly in combat aboard the Victoire, she earned the moniker "Red Valkyrie" among crew and military peers.

Her loyalty to Elene Gregor surpasses professional duty and platonic friendship; Giselle harbors unspoken romantic feelings. These intensify into a fierce protective devotion, driving her willingness to face extreme personal risk for Elene's safety. This deep emotional commitment later becomes a vulnerability exploited by adversaries.

After the Victoire's betrayal and sale to the Republic post-war, Giselle and the all-female crew are imprisoned and defenseless. She witnesses Elene's degradation by the Republic's representative, Roger, fueling silent rage and helplessness. Roger later targets Giselle directly. He manipulates her concealed feelings for Elene as psychological leverage during her own degradation. Overpowering her resistance, he subjects her to systematic humiliation to break her spirit and force confrontation with an abhorrent version of herself. Throughout this ordeal, Giselle remains acutely conscious of her reactions, particularly dreading Elene witnessing her compromised state – representing a profound loss of dignity and personal violation beyond the physical acts. Her character arc concludes with this descent under Roger's control.