The second son of the Kaul family, known for his impulsive and reactive nature, who starts as the clan's Horn and must adapt to new responsibilities after a significant turning point in the story.

The sole sister of the Kaul family, who initially rejects her Green Bone identity but finds herself taking on a crucial role within the clan upon her return to Kekon.

The adopted brother in the Kaul family, much younger than the others, grappling with feelings of indebtedness and the challenges of training as a Green Bone.

The original Weather Man for the Kaul family under Lan’s grandfather, acting as an antagonist, often providing cold and strategic advice at odds with family and tradition.

The formidable Pillar of the Mountain Clan, whose strategic and decisive leadership positions her as a significant antagonist in her pursuit of expanding her organization.

A small-time thief motivated by the desire to obtain jade and upset the existing power dynamics, viewing jade as the key to gaining status and power.