|Shows||Elena of Avalor|
|Friends||Princess Elena, Gabe, Naomi Turner, Princess Isabel, Zuzo, Chancellor Esteban, Francisco, Luisa, Armando, Princess Sofia|
|Family||Alakazar (grandfather) |
|Enemies||Fiero, Shuriki, Orizaba|
|Dislikes||Crowds (at times) His mother embarrassing him Disappointing his princess.|
Mateo is the grandson of former Avalor Royal Wizard Alakazar, and the current Royal Wizard under Crown Princess Elena's rule.
When Princess Sofia goes looking for Alakazar and arrives at his home, she is first met by Mateo's mother, Rafa, who dismisses her at first, but Mateo, overhearing everything, reveals himself and wonders what Sofia wants. When Sofia reveals she is trying to free Princess Elena from the Amulet of Avalor, Mateo aids her in summoning Zuzo, Alakazar's chanul, then joins Sofia and the Jaquins as they travel to the ancient Maruvian temple where the Crown of Aziluna resides, bearing witness as Sofia transforms into a mermaid, and then freeing Elena from the Amulet of Avalor per Zuzo's instructions.
Joining Elena as she returns to Avalor, Mateo remains with Sofia as Elena goes to deal with Shuriki alone, but fails, and reveals that Sofia's own family have now been made Shuriki's prisoners. Returning to his house, Mateo learns from his mother Rafa that she knows the spell to free Elena's little sister and grandparents from the enchanted painting that Alakazar imprisoned them in for protection 41 years ago when Shuriki took over. Returning to the palace, as Luna lures Shuriki and Chancellor Esteban out of the throne room, Mateo sneaks in, joined by Elena, Armando, and the Enchancia Royal Family shortly thereafter, and casts the spell, successfully freeing Isabel, Francisco, and Luisa from the painting.
Joining them on the Jaquins, they rally the citizens of Avalor City to march on the palace, and once Elena and Sofia open the gates to let everyone through, Mateo joins Elena, her grandparents, Sofia, and her parents as they lead the crowd to confront Shuriki, then watches as Esteban betrays Shuriki, throws her wand to Elena, and Elena destroys it, freeing Avalor from Shuriki's tyranny once and for all, and taking her place as Crown Princess as heir to the throne following Shuriki's murder of her parents, King Raul and Queen Lucia. Mateo joins in the celebration that follows.
After Shuriki's defeat and Elena reclaiming the throne as Crown Princess, Mateo follows in Alacazar's footsteps and succeeds him as Royal Wizard, with his first major challenge being confronting his grandfather's arch-enemy, Fiero, who returned seeking revenge and the legendary Codex Maru. Mateo succeeds in rebounding Fiero's spell back at him, turning him to stone, and retrieving the Codex Maru, using it to undo Fiero's spell he cast on everyone in the throne room, including Isabel, Esteban, and his mother Rafa.
However, later on, he decides to work on a Reversal Potion to restore Fiero, unaware he's told it to one of Avalor's most wanted criminals in Carla Delgado, disguised as Rita Perez, who passes it on to Shuriki, who plans to use it to attain her revenge on Elena and retake Avalor from her once more by reviving Fiero and recruiting him to her cause. Carla manages to get the key to Mateo's lab, get the potion, and give it to Shuriki, who revives Fiero, and Mateo is ambushed in his wrecked lab by Fiero, who manages to escape with several blank pages from the Codex Maru, before Mateo recovers and arrives to save Elena from Shuriki by arming her with her Scepter of Light. Mateo then gives pursuit of Shuriki and her team with Elena, Naomi, and Gabe, but lose sight of them and return to the palace to prepare Avalor for annoucing her return to the public.
Some time later, Mateo learns of his grandfather's actions regarding the dark counterpart to the Scepter of Light, the Scepter of Night, and joins Elena with tracking down the three pieces before Shuriki does with the aid of the riddles that Alacazar left behind leading to the locations of the pieces. They manage to get the first piece before preparing to go after the second with the support of all their friends.