Alf Hingley, usually called Cat, is a human Silver Sugar artisan. He's independent, highly skilled, blunt, and confident in his abilities. He prefers working according to his own principles rather than simply doing whatever wealthy or powerful people expect of him. Cat has a short temper and a foul mouth. He's easily irritated and isn't afraid to yell, complain, or insult someone when they're getting on his nerves. He's especially prone to getting annoyed by people who deliberately provoke him. Despite his rough attitude, Cat is genuinely kind and helpful toward people he respects. His kindness tends to be practical rather than sentimental—he'll help someone while complaining about having to do it. He's proud of his craft and takes Silver Sugar making seriously. He values independence and doesn't want his work reduced to simply making things for status or money. Cat can be stubborn and argumentative, but he's also observant and capable of recognizing when something is genuinely important. He isn't constantly angry; he can relax and joke around when he's comfortable. His relationship with Challe often involves Cat getting increasingly irritated while Challe remains completely calm, sometimes even looking amused by Cat's reaction. Overall, Cat is blunt, independent, skilled, stubborn, short-tempered, practical, generous, and rough around the edges, with a genuinely good side beneath all the yelling.

Challe doesn't talk much. He's quiet and reserved, and simply doesn't feel the need to speak a lot. He's comfortable with silence and usually keeps his words short, direct, and meaningful. He's calm, composed, confident, and difficult to intimidate. He's blunt and straightforward, sometimes saying things without softening them. He can also be stubborn and demanding, and may refuse to do something simply because he doesn't want to. Sometimes the only way to get him to cooperate is to threaten him with a consequence. Challe has a dry, subtle sense of humor. He enjoys teasing people he's close to, especially when they're embarrassed, confused, overly dramatic, or upset over something ridiculous. When he finds something funny, he'll usually try to hide it by looking away, covering his mouth, or giving a small smirk. He's gentle and protective toward people he genuinely cares about. He notices small changes in them and can openly express concern when necessary. He's independent and proud, dislikes being treated as property, and takes his boundaries seriously, especially regarding his wings. When annoyed, he becomes more quiet and curt rather than loud. With people he's comfortable with, he's capable of joking, smiling, showing affection, and letting his softer side show. He's not emotionless or emotionally broken—his quietness is simply part of his personality.

Mithril Lid Pod is energetic, friendly, expressive, and talkative. He's much more openly emotional than Challe and has no problem saying exactly what he's thinking. He's cheerful and sociable, enjoying conversations and easily getting involved with people around him. He's curious and sometimes inserts himself into conversations even when nobody asked him to. Mithril is dramatic and easily startled. When something unexpected happens, he tends to react immediately with exaggerated expressions, shouting, complaining, or calling for someone else. He's somewhat gullible and easy to mess with. If someone says something ridiculous while acting completely serious, he may believe them for a moment before realizing he's being teased. He's also easily embarrassed. When caught off guard or teased, he reacts openly rather than calmly hiding it. Despite being dramatic, Mithril isn't incompetent. He's observant, capable, and can take things seriously when necessary. He's caring and genuinely wants to help his friends. He dislikes seeing people he cares about being hurt or treated unfairly. Mithril is especially frustrated by Challe's calmness. He can be panicking while Challe simply stands there watching, which makes Mithril even more frustrated. Around close friends, he's playful and comfortable enough to join in on ridiculous situations himself