Bertrand, whose full name is Enlilta Reesehyde Bertrand, is a supporting character in the story. Initially serving as a knight belonging to the Imperial Guard, Bertrand undergoes a profound and involuntary transformation that defines the character's arc.

In terms of background, Bertrand was originally a male knight of the Empire. This changed when he killed the protagonist Yukito Urabe and his companions. In retaliation, the goddess Mitama resurrected Bertrand, but with a drastic alteration: the character's gender was swapped from male to female, much to Bertrand's dismay. This event marks the transition from an antagonist to a more complex figure.

Physically, after the transformation, Bertrand has dark amber skin, blue eyes, and bright blonde hair typically pulled back in a long ponytail with a lock falling over the forehead. The attire consists of a sleeveless white tunic reaching mid-thigh with a high collar, paired with a burgundy belt and tight-fitting trousers of the same hue. Large silver metal greaves protect the legs, with similar metal details on the wrists and forearms forming bracers reinforced by dark gauntlets. A long katana with a dark scabbard is carried at the left hip.

Regarding personality, Bertrand previously possessed an assertive attitude and exuded power as a male knight, following orders from superiors without question. After becoming female, Bertrand still exhibits attitudes from the days as a male but slowly adjusts to the new body and physical features. A strong sense of masculinity remains as a remnant of the former male identity. Over time, more feminine activities begin to emerge, such as showing modesty by covering up.

The character's motivations stem from the upheaval caused by the transformation. The Sacred Empire treats Bertrand as a completely different person and refuses acceptance, leaving the character lost and without direction. In this desperate situation, Yukito Urabe extends salvation, leading Bertrand to join his cause. A strong dependence on being needed by others develops as a result of these circumstances.

In the role of the story, after being killed and resurrected, Bertrand eventually becomes an ally to Yukito and the goddess Mitama. The character's skills and abilities come into focus when single-handedly eliminating dangerous beasts, earning the respect of the villagers. However, against powerful opponents such as Archons, Bertrand often struggles and finds it difficult to secure victory in combat.

Key relationships include the initial antagonistic connection to Yukito, having killed him before being resurrected and transformed, followed by Yukito later offering salvation. The Empire, which once employed Bertrand as a knight, rejects the transformed character entirely. The goddess Mitama directly caused the gender swap as an act of retaliation. The character Atar eventually encounters a transformed Bertrand in a bizarre outfit, who claims to be a humble servant of the new religion.

Regarding development, Bertrand begins as a loyal male knight of the Empire who kills the protagonist's group. After being killed and resurrected as female, the character struggles with identity and the rejection from the former allies. Eventually, acceptance of the new circumstances leads to joining Yukito's cause and adjusting slowly to the new physical form while retaining some masculine traits from the past.

Notable abilities include being an extremely skilled swordswoman capable of wielding a katana effectively. Bertrand demonstrates the combat prowess to eliminate fearsome monsters single-handedly, though this power has limits when facing the strongest beings in the world.