Phosphophyllite in the Ten Thousand Years Later version is rendered with a graceful yet resilient silhouette that captures her fragile gem-like nature. The figure features a pale mint-green hue with subtle pearlescent facets that glitter as light shifts across the surface. Crystalline limbs are sculpted with delicate, precise edges, hinting at her brittleness while still conveying a sense of strength through poise. Her attire blends ethereal armor plating with minimalist fabric accents, creating a contrast between fragile beauty and quiet endurance. The base imitates crystalline terrain and scattered fragments, underscoring her long existence through countless eras.

In Houseki no Kuni, Phosphophyllite is introduced as a young gem with a brittle constitution and a strong desire to contribute to her community. Over the series she grows from cautious, uncertain newcomer to a steadfast, compassionate figure who faces existential threats, conflict, and responsibility with quiet courage. Her journey explores themes of identity, memory, and the meaning of strength beyond physical durability. The Ten Thousand Years Later variant emphasizes the endurance of her spirit after long ages of change and hardship, portraying her as both a relic of the past and a beacon for resilience in a reformed world. Her interactions reveal kindness, curiosity, and an unwavering resolve to protect friends.