Sancho serves as a steadfast retainer, first to Pankraz and later to his son, Luca. This stout man sports curly brown hair, a pencil mustache, and distinctive eyebrows. He typically wears an orange tunic over a dull green undershirt and pants, accented by a blue collar, black boots, and yellow gloves. His oversized backpack, reinforced with wooden planks, signifies his meticulous preparation, always carrying essential supplies.

Initially found maintaining Pankraz's home in Whealbrook, Sancho cares for the young Luca. After Whealbrook's destruction and Pankraz's death, he departs, later resurfacing in Gotha to facilitate Luca's introduction to King Albert. He remains a constant presence after Luca's coronation and the birth of Alus. When antagonist Ladja abducts and petrifies Luca and Bianca, Sancho assumes responsibility for Alus. He protects the boy and searches the globe for eight years to locate the petrified Luca, ultimately aiding Alus in reviving him using a magical staff.

Sancho accompanies Luca, Alus, and their allies on subsequent quests to rescue Bianca and confront Ladja. During the final battle at Ladja's fortress, he arrives with crucial reinforcements—Bjørn the Behemoose and Prince Harry's troops—tipping the conflict in the heroes' favor and enabling Luca and Alus to defeat Ladja. His unwavering loyalty, humility, and quiet resilience define generations of service. He demonstrates practical versatility as a cook, caretaker, and combatant, revealing emotional depth in moments of profound concern, such as tearfully recalling Luca's mother as "intelligent and beautiful."

While his film role is condensed, key attributes remain: he provides Luca critical information about Pankraz's quest for the Zenithian Sword, and Bianca explicitly entrusts Alus to his care during Ladja's attack, reaffirming his surrogate parental role during the protagonists' petrification.