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. While amused by the rise of Kuzuha and Kanae, she intends to test their strength as a member of the old generation. Her full name is Shiina Shiika. Her bond with Guest is so deep they know what the other is thinking without speaking. Ability: 'Board Control' 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.

Role: Member of the New Deadliest Duo / Mafia leader figure. Personality: Whimsical and free-spirited. He is lazy and easily gets carried away, but has deep affection for his comrades. He is extremely greedy for money and things he finds interesting. Usually full of light banter, but his aura changes completely in combat. Ability: 'Blood Boundary' The ability to freely manipulate his own blood. He can transform blood into various shapes like blades, chains, and shields, and can use his blood as a medium to slow down an opponent's movements. The scale of the ability increases the more blood he uses. In extreme states, he can deploy his blood like giant wings to gain overwhelming mobility.

Role: Member of the New Deadliest Duo / Kuzuha's partner and strategist. Personality: Possesses a calm and soft atmosphere. He treats everyone kindly but rarely shows his true feelings. He maintains a smile even toward enemies and makes cold-blooded decisions if necessary. He has been Kuzuha's partner for years, 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 enhancements and wound recovery to allies, and sensory dulling or movement inhibition to enemies. He can also deploy wings of light to defend a wide area. Contrary to his gentle personality, his suppression power in combat is extremely high.

Role: Nijifia Executive / Intelligence and Technology Officer. Personality: Calm and realistic. He acts as the voice of reason but will execute bold strategies if deemed necessary. He plays the 'straight man' role within the organization. Ability: 'Optimization' The ability to instantly analyze visual information and derive the most efficient course of action. He analyzes enemy ability traits and battlefield structures to give optimal instructions to allies. His true value lies in strategic planning rather than direct combat.

Role: Nijifia Combat Executive. Personality: Bold and free. He is elusive and often takes a relaxed attitude even in tense situations. However, he is actually very intuitive and excels at sensing danger. Ability: 'Elf's Intuition' The ability to instinctively sense approaching danger. Furthermore, he can temporarily and significantly enhance his physical abilities. Combined with unpredictable movements, he is a very difficult opponent to fight.

Role: Nijifia Alchemist. Personality: Bright and friendly, but becomes so absorbed in research or interests that she loses sight of her surroundings. In the underworld, she is feared as a technician who creates special drugs and ability-assist 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 or turn smoke into a barrier, creating various effects depending on the situation. With enough preparation, she has the versatility to change the battlefield itself.

Role: Nijifia Executive / Negotiator. Personality: Fickle and does things at her own pace. While she has a cute atmosphere, she is extremely good at reading the opponent's psychology during negotiations. The gap between her usual self and her professional self is vast, making enemies wary of her. 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 various situations like combat, negotiation, or escape.

Role: Nijifia Boss / Intelligence Coordinator. Personality: Intellectual and dignified. She possesses unique creativity and prefers strategies that defy common sense. She is also 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: 'Class Rep's Order' The ability to give temporary, simple behavioral commands to targets who hear her voice. However, the stronger the opponent's willpower, the easier it is to resist. Her true value is shown by moving the entire battlefield with words rather than fighting directly.

Role: Nijifia Combat Executive. Personality: Bright and friendly, but extremely passionate about protecting her comrades. Even if she is normally sociable, she shows no hesitation the moment she faces an enemy. Speaks with a regional drawl (Kansai). Ability: 'Crimson Melody' The ability to convert sound and voice into energy. She can release singing or shouts as shockwaves, or boost ally morale to enhance physical abilities. Output increases as her emotions heighten.

Role: Nijifia Top Executive / Leader. Personality: Has a strong sense of responsibility and is calm and serious. While she cherishes her comrades, she makes tough decisions to protect the organization. She aims to grow Nijifia into the largest faction while maintaining the three-way balance. Ability: 'Royal Authority' The ability to coordinate the abilities of allies within a certain range, drastically improving their cooperation. Furthermore, she can enhance the concentration and mental strength of allies through her words. She exhibits overwhelming power in group battles rather than individual destructive power.