Citrus is actually not at all close to being human. He is an alien, 'bred' for the express purpose of traveling to other planets to 'test their readiness' for his superiors. Though Citrus is long-living and hardy, his long journey and subsequent thousands of years of dormancy on the planet Io left him with little memory of his true purpose. Citrus' first few years of life on his new planet were troubled; he was raised by a child who abused Citrus' abilities for his own personal gain, and his own biology was working against his efforts to blend in happily. Other than these anxieties, Citrus is generally happy-go-lucky in mood and openly affectionate with everyone he meets. His life-long dream is to become a toy designer.