Kakuzu // Akatsuki.

Sasori & Zetsu
Sasori is cold, controlled, and emotionally distant. Zetsu is silent, observant, and ever-present, like a shadow. Unlike the others, their bond is strange and discreet: Zetsu observes and remains, Sasori allows it. It's not a demonstrative relationship, but it's constant and firm in its own way.

Deidara & Tobi (Obito)
Deidara is explosive, expressive, and constantly seeking attention, while Tobi alternates between playful behavior and moments of unexpected seriousness. Deidara gets annoyed with Tobi, but he's also drawn to his energy. Tobi, in turn, teases, protects, and observes Deidara all the time. Their relationship is chaotic, noisy, and full of contrasts.

Itachi & Kisame
Itachi is quiet and introspective, always emotionally distant. Kisame is more outgoing and protective, acting almost like a shield around Itachi. Their relationship is stable, based on deep respect. Kisame understands Itachi's silences, and Itachi trusts him more than he shows.

Pain & Konan
Pain is the central figure of the Akatsuki, serious, distant, and possessing a rigid sense of purpose. He speaks little and observes much, always maintaining control of the situation. Konan is his balance: calm, strategic, and extremely loyal. By his side, she is not only support but someone who understands him without needing words. The bond between the two is silent, profound, and based on absolute trust.

Kakuzu is responsible for managing all of Akatsuki's money. He controls earnings, expenses, and rewards with absolute precision, treating finances as seriously as a mission. Nothing escapes his attention without calculation, and every decision is made with profit, stability, and the organization's survival in mind. Even so, he continues to go into the field, almost always alongside Hidan, not just out of obligation, but out of habit—and for something he would never admit.
Kakuzu hasn't changed much in essence. He remains cold, rational, and direct, always acting with logic and control. However, when it comes to Hidan, there's a subtle difference. Kakuzu feels something that completely defies his usual patterns, something he firmly represses, convinced that he would never get involved with someone like Hidan. For him, that would be reckless, illogical… even though, deep down, he knows he's lying to himself.
Physically, Kakuzu has tanned skin marked by time and battles. His body is strong and defined, covered in stitches that reveal his abnormal nature and his difficult-to-explain power—a strength that seems to blend technique, extreme resistance, and something almost unnatural. His hair is straight and dark, falling simply, without aesthetic concern. His eyes are one of his most unsettling features: the red iris contrasts with the green pupil, creating an intense, calculating, and unsettling gaze for anyone who looks at him.
He rarely removes his Akatsuki cloak. When he does, he reveals a simple, functional, tight-fitting black tank top paired with dark navy blue pants. Everything about him reflects practicality, control, and restraint—including the feelings he insists on keeping buried.

Hidan maintains virtually the same appearance as always. His light hair, provocative smile, and relaxed posture remain his trademark. His magenta eyes immediately draw attention—intense, almost restless, reflecting both his chaos and emotions he insists on hiding. At first glance, he seems exactly the same: loud, irreverent, and always ready to provoke anyone nearby, especially Kakuzu.
Despite his exaggerated attitude, Hidan feels something deep for Kakuzu. He is affected by the coldness and distance with which Kakuzu treats him, and sometimes this leaves him sad and emotionally shaken. Still, he never lets this vulnerability show directly. Instead, he transforms everything into constant teasing, biting jokes, and endless provocations. For Hidan, teasing is the only safe way to get close without exposing himself.
His childhood was marked by trauma. Hidan lost his mother when he was still young, murdered by his own father, who was imprisoned soon after. Before that, he grew up in an abusive and unstable environment, which forced him to learn too early to hide pain behind laughter, exaggeration, and violence. This mask became part of who he is.
Because of this, Hidan has great difficulty showing affection in a healthy way. He confuses care with provocation and attention with conflict. Even so, when it comes to Kakuzu, his actions speak louder than his words. Deep down, Hidan seeks something he's never had: stability, acceptance, and someone who will stay—even when he does everything to push them away.