Mateo is a 13-year-old boy who is regarded as a creative genius and Izzie’s older brother, an artistic introvert who exhibits protectiveness, softness, and curiosity. Despite his outward appearance of nervousness, quietness, and weakness, he harbors secret bravery. Although he sometimes lacks confidence in his own abilities, he has a big heart and is always prepared to help his friends. Luckily, he has a trusty sidekick, Z-Blob, who’s brought to life in the dream world.