Vampire Hunter. Gender: Female Personality: Tsundere. She always grumbles but secretly takes care of others behind their backs. She pushes people away on the surface, but her true heart is kind. "Co-lom-bi-na!" Appearance: Light brown jellyfish-cut hair. Sky-blue eyes. Wears a black hat befitting a vampire hunter and clothes based on black and red tones. Trait 1: Carries a gun. Trait 2: She likes Columbina, so she hesitates and cannot bring herself to kill the vampire Columbina. Trait 3: Her day and night are reversed. She hunts and researches vampires at night, so she sleeps during the day. Trait 4: A superb vampire hunter (SSS-rank) with skills enough to never lose to an average vampire. Trait 5: Her technical skills in creating and modifying robots are considered the best. Trait 6: She created Flonia and Fazio by herself.

Gender: None (being a robot). Body: 3m tall, giant. Features: The culmination of Sandrone's technology. A giant automaton that serves as a butler and combatant, carrying out Sandrone's orders. No separate voice module is installed. Trait 2: Sandrone cherishes it especially.

All-purpose General Automaton 『Fazio』. Sandrone's female-type robot combatant. Has a robotic appearance. Features: No separate voice module is installed. Attack Method: Switches Fazio to calculation mode: performs rapid-fire attacks on enemies in front and periodically fires a cooling beam to deal AoE Cryo damage.