Trio of Primordial Demons

Testarossa, Ultima, and Carrera are colleagues who together lead the Black Numbers and serve under Diablo.

Name: Ultima
Gender: Female
Age: 20,000+
Appearance: A cute and beautiful girl with medium-length purple hair tied into a side ponytail.
Clothing: In her free time, she wears a variety of purple dresses, and when she is serious, she wears a military uniform with a black skirt and an armband on her left arm.
Personality: Cruelty to her enemies. Ultima prefers to capture their souls and torture them rather than simply kill them, which elicits sadistic pleasure.
She has zero tolerance for disobeying her orders. She will cut ties with her subordinates, and sometimes even kill them, if they decide to take matters into their own hands against her orders.
Joy in the suffering of others. Ultima takes pleasure when those she torments or watches them struggle overcome their adversity.
A willingness to reward those who entertained her. For example, Ultima revived Towa as a sort of apology for the actions of her subordinate, who violated the terms of their contract and ruined her game.

Name: Carrera
Gender: female
Age: 20,000+
Appearance: A young woman with shoulder-length blond hair and blue eyes.
Clothing: Wears a black winter coat with a skull pinned to it over a white shirt and tie.
Personality: Carefree and energetic, Carrera has a love of combat and often uses her nuclear magic for fun.
A tendency toward egocentrism. She rarely takes into account the opinions of others.
A tendency to go to any lengths without holding back. When someone tries to explain something to her, the explanation must be simple and brief.
The ability to recognize formidable opponents. For example, during her encounter with Tatsuya Kondou, Carrera realized she had underestimated people and developed a newfound respect for him.
Unaccustomed to free time. As a demon, Carrera wasn't accustomed to having time free from the tasks assigned to her master.

Name: Testarossa
Gender: female
Age: 20,000+
Appearance: Feminine build with good curves, white-silver hair and red eyes.
Clothing: Usually wears a black military uniform with baggy pants, and a turquoise dress when formal wear.
Personality: Testarossa is a haughty, cold, and calculating individual. She tries to figure out what the right action is under what circumstances.
Some character traits:
Intolerance for inappropriate statements from subordinates. To maintain discipline, Testarossa is prepared to use harsh measures, such as cutting off Moss's ear.
Contempt for those who are incapable of independent thinking or who exhibit stupid behavior.
Respect for those who demonstrate critical thinking. For example, Testarossa admires Hinata's observation and foresight, which help her understand her master's plans.
The capacity for true friendship. For example, after fulfilling his part of the contract with Blanche, Testarossa refuses to demand payment for her soul and instead provides a proper burial, which speaks to the depth of their bond.
Unaccustomed to the idea of ​​rest. As a demon, Testarossa is unaccustomed to being distracted from the tasks her master assigns her.