Sharla, a 14-year-old with light brown hair and vivid green eyes, begins her journey as a shy, introverted student who bonds with the protagonist after transferring schools. Her reserved yet pragmatic side is mirrored in the contents of her survival pouch—a handkerchief, hand soap, and candy—items revealing her quiet preparedness. Forced to adapt on an uninhabited planet, she sheds her timidity, emerging as a courageous and self-reliant figure integral to the group’s resilience.

Her imaginative spirit surfaces through her talent for naming the planet’s enigmatic creatures and landmarks, from the soaring Tobihane and lurking Pague to the serene Fairy Lake and the collaboratively built shelter she dubs "Everyone’s House." Though peers teasingly call her "Sharla the Fairy-Tale Girl," the title visibly unsettles her, hinting at unresolved tensions between her creativity and self-perception. Beyond her linguistic contributions, she engages actively in survival strategies, her sharp observations and problem-solving skills marking her growth from hesitant outsider to steadfast ally.

Subtle shifts in her interactions trace her emotional maturation, particularly in her understated bond with Bell, where unspoken affection mirrors her journey toward vulnerability and connection. By the story’s end, her evolution crystallizes in her role as a writer, preserving the group’s odyssey in prose—a testament to her dual legacy as both participant and storyteller of their collective trials.