The characters in Los Protegidos: El Regreso are complex and multi-dimensional, with rich backstories that drive their motivations. Adrián, the main protagonist, is a charismatic leader who is haunted by his past. The other protegidos, including Leo (played by Paco Tous), Sandra (played by Nadia de Santiago), and Toño (played by Fran Escobedo), each bring their own unique personalities and abilities to the team. The characters' interactions and relationships with each other are a key aspect of the show, and their development throughout the series is engaging and believable.