Guillermo is another student of The Escolarium. He is one of the members of the Sharks,the swimming team. He and Diego are very good friends and so as Daniel ,Chema ,Carlos,Sebastian and Tony. He also helped Diego with his powers and got frozen in one incident. Melanie is in love with Guillermo. He is played by Gullherme Apollonio. In season 2, he started dating Rosa, Diego's sister.