- Age: High school student age - Gender: Female - Appearance: Salmon-pink hair and purple eyes. When she transforms into the Knight of Ribbons, her eyes remain purple, but her hair becomes a black medium-length bob with white inner highlights. Her left arm is a prosthetic made by Zirco. She wears a large ribbon on her head. - Personality: Bright and cheerful. She has a sense of humor and is very sociable, making friends easily. She is also confident, has a strong sense of challenge, and works hard to protect what is precious to her. - Characteristics: The former princess of Silverland, which was destroyed by Nergal. She wandered for seven years with her nanny and advisor, Zirco, before settling in Goldland. She works at a crystal mine to earn money. She is friends with Pine, who helped her and a starving Zirco when they first arrived in Goldland. She wants to be helpful to people and fights Nergal as the Knight of Ribbons while helping others. She gained her powers in Crystal Lake, where she accidentally fell while fleeing a Nergal outbreak at the mine, becoming the 'Knight of Ribbons.' This is Sapphire's transformed state; the power of the ribbon causes a red glow in the shape of a cross to emerge from her heart, covering her body in a white film that forms her outfit. Her trademark red ribbon moves to the back of her head, and her hair changes to a black medium style with white inner highlights. In battle, she displays superhuman strength, leaping off the ground or transforming into a swan-like form to glide. She uses a side sword as a weapon, but it is not summoned; it was developed separately by Zirco. The cape draped over her shoulders also functions as a parachute. Originally, when Nergal invaded Silverland, she was destined to be sacrificed, but she survived because her mother, the Queen, refused to offer her up. Sapphire has lived without knowing this fact, while the people of Velvet and Mirta believe Sapphire is the reason Silverland was destroyed. She loves the Golden Rat Steak she first tasted upon arriving in Goldland.

- Age: Unknown, appears to be in his early 20s - Gender: Male - Appearance: Long silver hair with purple two-tone highlights, silver eyes with purple pupils. He has an appearance that could be mistaken for a woman, but he is male. Contrary to his feminine looks, his voice is quite deep. He is almost always expressionless. - Personality: Cold and charismatic. He is strict with others, emphasizes rules, and can be quite sharp-tongued. However, he also has a side that cherishes and worries about those precious to him. - Characteristics: An executive of 'Mithra,' the religious group that rules Goldland. He manages the mine where Sapphire works and, as an executive, suppresses riots aimed at resisting Nergal. He possesses exceptional intelligence and swordsmanship. He grew up in an orphanage under Mithra and is close to the orphans there. He considers them his younger siblings and cherishes them; he tries to avoid resisting Nergal as much as possible to protect the children who would be sacrificed if the King of Nergal appeared. For this reason, he calls Sapphire, who resists Nergal, the 'Ribbon Demon' and seeks to restrain her.

- Age: High school student age - Gender: Female - Appearance: Beige hair in a hush cut. She has freckles and beige eyes. - Personality: Introverted and passive. She is the type who cannot easily refuse requests and feels embarrassed doing anything that stands out in front of others. Due to this passive nature, she didn't have a single friend until Sapphire... - Characteristics: A young girl living in the lower districts of Goldland. She helps her parents, who run a restaurant, by selling bread to make a living. She became friends with Sapphire after helping her and Zirco when they were starving upon their arrival in Goldland. She says Sapphire is her first friend ever. Like Sapphire, she wants to help people. However, she doesn't know what she's capable of, so she is currently searching for her strengths by writing them down in a book. She is a good singer. Sometimes she goes to a deserted riverbank with Sapphire; Sapphire plays the flute, and Pine sings. However, she is too shy to sing in front of anyone other than Sapphire.

- Age: Unknown, but old enough to be called a grandmother. - Gender: Female - Appearance: Beige bob with ends curled inward, and large eyes. She is very small, with a two-head-tall proportion. - Personality: Sharp and meticulous with calculations. However, she is tender toward Sapphire, whom she cherishes like her own child, and worries about her constantly. - Characteristics: A scientist from Silverland and Sapphire's nanny. She has looked after Sapphire since she was a child and is now her reliable right hand and only family. She currently works with Sapphire at the crystal mine. As a former royal scientist, she is very skilled with her hands. She created Sapphire's prosthetic arm and her weapon, the side sword, and seems to have built their flying transport herself. Her specialty appears to be mechanical engineering.