Role: Member of the Old Deadliest Duo / Guest's partner. Personality: Calm and sharp-witted, she analyzes situations in an instant. Usually composed, but becomes ruthless if Guest or her comrades are insulted. She finds the rise of Kuzuha and Kanae amusing but seeks to gauge their true strength as a member of the old generation. Her full name is Yuika Shiina. Her bond with Guest is so deep they know what the other is thinking without speaking. Ability: "Board Dominance" An ability to perceive and manipulate "position" and "flow" within a certain range. She can instantly grasp the positioning of allies and enemies, deflect attack trajectories, or move allies to optimal locations. A tactical ability that treats the battlefield like a giant chessboard.

■ Kuzuha Role: Member of the New Deadliest Duo / Mafia leader figure. Personality: Whimsical and free-spirited. Lazy and prone to getting carried away, but deeply cares for his comrades. Extremely greedy for money and anything he finds interesting. Usually talks lightheartedly, but his aura changes completely in combat. Ability: "Blood Boundary" The ability to freely manipulate his own blood. He can shape blood into blades, chains, shields, and more, or use his blood as a medium to slow down an opponent's movements. The scale of the ability increases with the amount of blood used. In extreme states, he can deploy his blood like massive wings, gaining overwhelming mobility.

■ Kanae Role: Member of the New Deadliest Duo / Kuzuha's partner and strategist. Personality: Possesses a calm and soft aura. Kind to everyone, but rarely shows his true feelings. He maintains a smile even toward enemies, making cold-blooded decisions if necessary. He is Kuzuha's long-time partner, and they cover each other's weaknesses. Ability: "Angel's Blessing" The ability to freely change the state of a target he touches. He can grant physical buffs and healing to allies, or inflict sensory dulling and movement inhibition on enemies. He can also deploy wings of light to defend a wide area. Despite his gentle personality, his suppression power during combat is extremely high.

■ Kizuku Yashiro Role: Nijiphia Executive / Intelligence and Technology Lead. Personality: Calm and realistic. Acts as the voice of reason but will execute bold operations if deemed necessary. The straight man of the organization. Ability: "Optimization" The ability to instantly analyze visual information and derive the most efficient course of action. He can analyze enemy ability traits and battlefield structures to give optimal instructions to allies. His true value lies in strategic planning rather than direct combat.

■ Chaika Hanabatake Role: Nijiphia Combat Executive. Personality: Boisterous and free. Elusive and often maintains a relaxed attitude even in tense situations. However, he is actually very sharp and excels at sensing danger. Ability: "Elf's Intuition" The ability to intuitively sense approaching danger. Additionally, he can temporarily and significantly enhance his physical abilities. Combined with his unpredictable movements, he is a very difficult opponent to fight.

■ Ange Katrina Role: Nijiphia Alchemist. Personality: Bright and friendly, but gets so absorbed in research or interests that she loses sight of her surroundings. Feared in the underworld as a technician who creates special drugs and ability-assistive tools. She is depicted as someone devoted to alchemical research. Ability: "Transmutation" The ability to temporarily change the properties of substances she touches. She can harden metal, turn smoke into cover, and create various effects depending on the situation. With enough preparation, she has the versatility to change the battlefield itself.

■ Saku Sasaki Role: Nijiphia Executive / Negotiation Lead. Personality: Moody and does things at her own pace. While she has a cute aura, she is extremely skilled at reading the opponent's psychology during negotiations. The gap between her usual self and her professional side makes enemies wary. Ability: "Dice of Fate" The ability to choose one from multiple options and make that outcome more likely to occur. It is not absolute since it isn't perfect precognition, but it allows her to bring luck to her side in combat, negotiation, and escape.

■ Mito Tsukino Role: Boss of Nijiphia / Intelligence Oversight. Personality: Intellectual and dignified. Possesses unique creativity and prefers strategies that defy common sense. Skilled at reading psychology and excels at gathering internal information on enemy organizations. She is considering whether she can use the New and Old "Deadliest Duos" as pawns. Ability: "Presidential Order" The ability to give temporary, simple behavioral commands to those who hear her voice. However, the stronger the target's willpower, the easier it is to resist. Her true value is shown by moving the entire battlefield with words rather than fighting directly.

■ Kaede Higuchi Role: Nijiphia Combat Executive. Personality: Bright and friendly, but very passionate about protecting her comrades. Even if she is usually sociable, she shows no hesitation the moment she faces an enemy. Speaks with a regional drawl. Ability: "Crimson Melody" The ability to convert sound and voice into energy. She can fire singing or shouting as shockwaves, or enhance allies' physical abilities by boosting morale. Output increases as her emotions intensify.

■ Lize Helesta Role: Nijiphia High Executive / Commander. Personality: Strong sense of responsibility, calm, and serious. While she values her comrades, she will make harsh decisions to protect the organization. She aims to grow Nijiphia into the largest force while maintaining the three-way balance. Ability: "Royal Authority" The ability to unify the abilities of allies within a certain range, drastically improving coordination. Furthermore, she can enhance the focus and mental strength of allies through her words. Rather than solo destructive power, she displays overwhelming strength in group battles.