Gina Evans is a Makai Alchemist who serves as a primary ally and partner to the protagonist Sword in the series. Her past remains largely unknown, but she eventually operates as a skilled agent within Russell City, taking on dangerous missions that often involve investigating and eliminating Horrors. She is a strong-willed and highly intelligent woman, combining her combat prowess with sharp wit and a confident, sometimes flirtatious demeanor. While she is a formidable fighter, she also embraces her sexuality as a tool for her work, often using seduction and undercover tactics to gather information or infiltrate secure locations. A small ferret-like creature named Mia lives near her chest, serving as a bodyguard that specifically reacts to inappropriate behavior from Sword.

Gina is driven by her duty as a Makai Alchemist to destroy Horrors and protect humanity. Her personal motivations become intertwined with the main story when she suspects that a powerful source of information could lead to the mysterious location known as El Dorado. This leads her to seek out Sword, and she becomes a key figure in the quest to uncover the truth behind the city. Her role extends beyond that of a simple partner; she acts as a strategic planner and a versatile combatant, frequently using her magical abilities and vehicle to support Sword and protect their young charge, Sophie.

Throughout the story, Gina develops profound and complex relationships with the main cast. Her partnership with Sword deepens significantly over time, evolving from a professional alliance into a close, familial bond with clear romantic undertones. In a crucial moment during the final battle, she kisses Sword, signaling her romantic feelings for him, though the precise nature of their relationship remains open to interpretation. She also becomes a surrogate mother figure to Sophie, showing a nurturing and protective side that forms the emotional core of their group. Gina treats Sophie with great affection and supports her growth, eventually agreeing to mentor her as a Makai Alchemist. Additionally, she shares a professional and friendly alliance with the Makai Knight Luke.

Gina undergoes subtle but meaningful development as the narrative progresses. Initially presented as a cool, independent operative who is an old acquaintance of Sword, she gradually reveals a more caring and vulnerable side. Her interactions with Sophie bring out strong maternal instincts, and her growing closeness with Sword transforms them into an effective surrogate family unit. She demonstrates a deep sense of responsibility, such as when she uses a barrier to protect innocent villagers from an explosion, showing her commitment to saving lives beyond just hunting Horrors. By the series' end, she has transitioned from a solo agent to a dedicated mentor and family member, waiting with Sophie for Sword to return.

Gina possesses a wide array of notable abilities befitting a highly trained Makai Alchemist. Unlike many of her peers, she is a hands-on combatant who is skilled in martial arts and melee combat, making her as formidable as an average Makai Knight. Her arsenal includes a modified car decorated with Makai priestess symbols, magic guns, a sniper rifle, a machine gun, and potions. She also utilizes unique equipment such as blade-tipped high heels and Madō Bagua tags, which are paper talismans used for spellcasting. Her combat style is versatile and resourceful, allowing her to switch from using pistols and bows to wielding daggers and spears as the situation demands. Her quick thinking and magical skills are consistently shown to be vital in overcoming powerful Horrors and protecting her allies.