Crescent is a moon-shaped extraterrestrial being from another planet. He arrived on Earth after the spacecraft he occupied alongside his brother, Corona, crash-landed in a desert, leaving both stranded without a way home.

Discovered by a human named Funny, who treated him and Corona as domesticated animals rather than sentient beings, Crescent exhibited a highly reactive temperament. He frequently became intensely distressed or enraged by seemingly minor incidents, leading to irrational decisions and actions. His existence involved adapting to Earth while contending with Funny's unpredictable and neglectful behavior. Crescent consistently sought recognition and validation from Funny, but these efforts were largely ignored, positioning him as a frequent target of mistreatment.

Specific incidents highlighted his overlooked role: expulsion after presenting a disliked portrait, and receiving physical discipline instead of medical help when choking on an apple. These reinforced his struggle for attention. Crescent occasionally displayed creativity, like drawing a face on a cabbage that Funny momentarily embraced as a substitute infant, representing a rare positive interaction. His problem-solving could escalate to extremes, exemplified by removing his own eyeballs to investigate a rainbow, resulting in self-inflicted injury when he crushed them. Despite occasional moments of connection, like the cabbage episode, Crescent's fundamental circumstances remained unchanged. He continued residing with Funny and Corona, persistently navigating his neglected position while stranded on Earth.