Bell is depicted as a young woman with short blond hair and dark green eyes, often accompanied by a somewhat weary or indifferent expression. Her wardrobe varies widely, ranging from casual attire such as T-shirts and jeans to more formal, uniform-like outfits resembling those of a flight attendant.

Her clothing is typically form-fitting or revealing, frequently emphasizing her cleavage. A notable accessory in her design is the large backpack she almost always carries, which serves as a recurring part of her appearance.

Bell is characterized by a cheerful and energetic nature, though beneath her playful exterior she is intelligent, resourceful, and at times deceptive. As a professional treasure hunter, she possesses a strong sense of curiosity, particularly toward objects or places that are concealed or difficult to access. Despite her adventurous lifestyle, she also has a feminine side, with a fondness for the color pink and cute stuffed animals.

She is notably drawn to men with great power, which contributes to her romantic interest in Staz Charlie Blood. While she often displays tsundere-like behavior toward him, alternating between aloofness and affection her feelings are genuine, occasionally leading to jealousy toward Fuyumi. In the manga, it is made clear that Staz neither reciprocates nor fully understands Bell’s emotions, leaving her affection largely unacknowledged.

Bell is the daughter of Heads Hydra and Nyen of the Hydra family, a bloodline renowned for its mastery of dimensional magic. From a young age, she demonstrated exceptional skill in spatial sorcery, earning the encouragement and support of her father as she refined her abilities.

Bell first appears while investigating the theft of her Black Curtain, a magical gateway that connects the Demon World and the Human World. During her search, she encounters Staz Charlie Blood and Yanagi Fuyumi, suspecting Staz of being the culprit. To test him, she subjects him to a series of trials before concluding that he was not responsible, though she continues to keep a wary eye on him. Over time, she develops romantic feelings for Staz, which leads to recurring interactions and deepens her involvement in the story.

Bell also forges a strong bond with Fuyumi, initially as a companion and later as a sister after learning of their familial connection. This revelation strengthens their relationship, allowing them to rely on one another more closely.

Throughout the series, Bell uses her magic to aid in the effort to restore Fuyumi to life. In addition, her abilities as a sorceress and treasure hunter enable her to uncover hidden information regarding the darker conspiracies at play within the Demon World. However, she often chooses to withhold these discoveries until she deems it necessary to reveal them.

Spatial Magic
Bell specializes in spatial magic, a rare ability that allows her to manipulate gaps in space to travel across distances instantly. Unlike other members of the Hydra family, who can transport themselves at will, Bell requires a physical frame to create a portal. These frames function like windows, enabling her not only to pass through them but also to observe distant locations.

Her magic is versatile, allowing her to transport others, redirect physical and magical attacks, and even sever limbs by closing portals around a target. She demonstrated the latter when capturing and restraining Akim.

Materializing Magic
In addition to her spatial techniques, Bell can manifest her magic into tangible constructs. For example, in episode 8, she enclosed herself within a magical box, using it to shift between frames while engaging in combat.

Frames
Bell’s spatial magic requires the use of frames to open portals. She typically carries a collapsible frame that can be expanded when needed, though she can also form a frame using her fingers, a method she often employs for spying.

Backpack
A signature part of her appearance, Bell’s large backpack contains her tools, magical items, and treasures collected during her travels.

Treasure Note
A personal notebook where Bell records desired items and goals. While primarily filled with notes about treasures, it also humorously includes “Operation: Get-Staz-To-Love-Me.”

Pistol
Bell wields a handgun with notable precision. She frequently combines it with her spatial magic to catch opponents off guard, redirecting bullets through portals for surprise attacks.

Staz Charlie Blood
Bell develops romantic feelings for Staz after their first encounters, initially drawn to his strength and unique personality. Though she often acts in a tsundere-like manner toward him, her affection is genuine, sometimes leading to jealousy of Fuyumi. In the manga, it becomes clear that Staz neither reciprocates nor fully understands her feelings, leaving her love largely one-sided. Despite this, she continues to support him in his efforts, often placing herself at risk to aid him.

Yanagi Fuyumi
Bell and Fuyumi share a close friendship that grows deeper throughout the series. Initially companions, their relationship strengthens after Bell discovers that Fuyumi is her younger sister. This revelation not only deepens their bond but also provides Bell with additional motivation to assist in restoring Fuyumi’s humanity.

Hydra Family
As the daughter of Heads Hydra and Nyen, Bell is an important member of the Hydra family of sorcerers. Her exceptional skill in spatial magic reflects her lineage, though her independent and adventurous personality often sets her apart from her family’s expectations.