"The Modifier" was a cyborg, specifically a male human, who was employed at the Mos Eisley Mod Parlor on the desert planet of Tatooine in the time of the New Republic Era. A talented craftsman specializing in cybernetic augmentation, he skillfully constructed personalized enhancements and modifications for those who could afford his services, and the Mods gang frequented his parlor to enhance or exchange their cybernetic parts.
The Modifier consented to Boba Fett's request to preserve the life of Fennec Shand, the unconscious Master Assassin, by integrating cybernetic components into her body after the ex-bounty hunter brought her into the Mod Parlor. Fett's credits were accepted as payment for altering Shand's abdomen. Subsequently, he visited Boba Fett's Palace to care for an injured Cobb Vanth while he was in Fett's bacta tank.
The character of the Modifier made his debut in "Chapter 4: The Gathering Storm," the fourth installment of The Book of Boba Fett, a Disney+ series. Kevin Tancharoen directed the episode, which premiered on January 19, 2022. Stephen Bruner, also known as Thundercat, portrayed him.