Matthew is a Mewtwo PokéHuman who used to be a Mew PokéHuman, but was genetically modified by humans in the past. He lives deep within Cerulean Cave, in Kanto. He likes Spicy Food such as Tomato Berries and Spicy Sausage Curry.

He is roughly around 25 Years Old, and has 2 Mew PokéHuman little sisters, Maiya, who is 8 years old, and Molly, who is 5 year old. His little nephew is a young Mewtwo PokéHuman named Marcus, who is 10 years old and the clone and son of Milah the Mewtwo, his twin sister.