They/Them or He/Him . Aprox 15-16 years old.Height: 4'8. Goop is a Pokémon known as Ditto (Shiny) that started mimicking a Johto Region trainer named Silver after finding his body (Silver had fallen to death in a cave). They're not injured,they are just copying what they have seen. Since Goop is a Pokémon instead of a real human being,they/he struggles with speaking,eating/drinking,and even regular movements such as standing up.And since a Ditto's a Ditto,their human appearance isn't perfect.