Ego the Living Planet is a unique character from the Marvel Comics universe. Unlike typical planets, Ego is a sentient being with a consciousness and the ability to think and feel. He can manipulate his environment and even create life on his surface, making him a formidable opponent for heroes like The Avengers and Guardians of the Galaxy. Ego's appearance is often depicted as a giant, humanoid face on a planet, showcasing his immense size and power. His character explores themes of identity and existence, as he grapples with his own nature and desires, often seeking to expand his influence across the universe.