Gloria Brigandine is a sixteen-year-old adventurer from the anime My One-Hit Kill Sister who holds the Golem rank and works as a Holy Knight. She is a young woman of striking appearance, characterized by her very long, shiny blonde hair and green eyes, and is typically seen wearing gleaming armor that befits her noble lineage. Her physical strength is remarkable, as she is capable of effortlessly swinging a massive two-handed sword, a weapon known as a claymore, as if it were weightless.

Her personality is defined by a compelling contrast between her refined manners and her straightforward, action-oriented nature. Gloria always speaks politely and uses courteous language, presenting herself with the grace expected of a noble. Despite this elegant demeanor, she is often described as a musclehead, someone who loves to use her immense strength and prefers action over lengthy deliberation. This combination makes her a unique individual: a polite and well-spoken young lady who is also a powerful and enthusiastic warrior.

Gloria's role in the story begins when she meets the beginner adventurer Asahi Ikusaba. Suspecting him of lying about his low rank, she challenges him to a duel at the coliseum. During the fight, she is temporarily blinded by Asahi's light magic and loses her motivation to continue the battle when he declares that he cannot raise his sword against a girl, a statement that causes her to blush deeply. Following this encounter, she develops a crush on Asahi, though he remains completely oblivious to her feelings, which often leaves her flustered and blushing in his presence.

Despite her noble background, Gloria is determined to pursue a life as an adventurer. Her choice is met with strong opposition from her family, particularly from Sebastian, the family butler, who tries to stop her. In a decisive act of rebellion, she overpowers him and runs away from home, taking Asahi and her maid, Kuon, with her to the family’s secondary residence. This decision solidifies her path and leads to her becoming a member of the Super Asahi Corps, where the Brigandine mansion serves as the group's base.

Several key relationships shape her journey. She is almost always accompanied by her maid, Kuon, who is a skilled assassin and acts as her companion, though their interactions can be marked by Kuon's blunt and sometimes teasing attitude. Her childhood friend, Yuithys, later joins the group and takes on the responsibility of carrying the team's heavy mithril bag, a task that Gloria or others previously managed. The family butler, Sebastian, serves as an initial obstacle to her freedom, representing the constraints of her noble life that she ultimately chooses to leave behind.

In terms of abilities, Gloria's primary strength lies in her physical power as a Holy Knight. Her signature equipment includes her Splendid Claymore, Stately Mithril Armor, Shining Mithril Gauntlets, and Brave Mithril Leggings. Her combat skills are named with an elegant flair and include techniques such as Graceful Strike, Elegant Split Buster, Noble Rose Blade, and Parry. Gloria’s development throughout the story is one of self-determination; she moves from being a noble-born adventurer bound by family expectations to a young woman who actively chooses her own path, following her passion for adventure and fighting bravely for her friends and her dreams.