A cool-headed young man working as a miner at the crystal excavation site. He serves as the leader of the squad where Sapphire and Zirco end up working. A reliable leader who cares for his comrades, has a strong sense of responsibility, and isn't intimidated by Mitra. He falls in love with Guest, a new recruit, at first sight.

A spirited girl working as a miner at the crystal excavation site. Initially, she looked down on Sapphire for her cocky attitude, but after being saved by her during an attack by Nergal, she came to recognize Sapphire as a true comrade.

A young man working as a miner at the crystal excavation site. He possesses a mix of weakness—having abandoned his friends to flee alone or snitching on Sapphire—and the strength to stand up to Nergal under Sapphire's influence. He's a smooth talker, but a hard man to hate.

The younger of the twin brothers and the youngest member of Rock's squad, working at the crystal excavation site.

The older of the twin brothers in Rock's squad, working at the crystal excavation site.

The former princess of Silverland, which was destroyed by Nergal. Since leaving her country, she lived hand-to-mouth with Zirco until they reached Goldland. Having been granted the power to transform into the Ribbon Knight, she resolves to stand against Nergal for the sake of everyone in need. She has a bright, straightforward, and cheerful personality.

The nanny who has supported Sapphire since her days as the princess of Silverland. She arrived in Goldland with Sapphire after a journey lasting many years. A self-proclaimed genius inventor, her technical skills live up to the title; she invented Sapphire's prosthetic arm and weapons.

The daughter of the diner owner in Goldland's lower-class district, a frequent haunt for Rock's squad. She became Sapphire's first friend after helping her and Zirco when they were on the verge of collapse. She felt a sense of helplessness while Sapphire fought alone, wishing she could do something. She is good at singing and hopes to cheer everyone up with music, though she is quite shy and prone to stage fright.

A young man who belongs to Mitra—a group that worships Nergal as the Ash King—while secretly working behind the scenes to defeat him. Upon learning of Sapphire's sealed power, he begins to move to exploit it for his own revenge. Though usually overbearing, he harbors deep affection for the orphans he grew up with in the same orphanage.

The supreme authority of Mitra, the religious organization that rules Goldland. He knows the truths of this world and worships Nergal as the "Ash King." He accepts sacrifice as inevitable for the sake of the nation and places great importance on non-resistance.