ELEMON features young inventor Leo and his creation of elemental monsters called Elemons, alongside characters such as Leo's twin sister Ella, a Professor, and a robot caretaker. No character named Mateo appears in this series. The name Mateo exists in separate contexts: Mateo de Alva from *Elena of Avalor* and Matteo Alighieri from *The Gully*, among unrelated media references, none of which connect to ELEMON.