Zelgadis Greywords is a sorcerer who begins as a retainer for his ancestor Rezo, an enemy of Lina. He is a chimera made of rock, golem, “brau” (English “blow”) demon, and human. Zelgadis specializes in Shamanistic magic, which pulls its power from the astral, or spiritual, plane. His elemental spells, including Stone Spiker and the mighty Ra-Tilt, are formidable. Since he is part blow demon, he is unable to cast black magic, as doing so would require him to call upon the power of another demonic being——which, in the Slayers universe, is akin to willing oneself out of existence. Though he is not as learned in the art as Lina, Zelgadis’ even combination of physical force and magical finesse render him among the most fearsome warriors.
Zelgadis is an enigma to his comrades, due to his quiet and asocial nature. Despite traveling with Lina and her friends, he considers himself separate from them and even a little bit evil, as “the heartless mystical swordsman” of the group. When he was a teenager, Rezo transformed him into a three-part chimera. He travels with the Slayers to find a spell that can change him back into a human. Despite the incredible abilities bestowed upon him by the transformation, he dislikes his appearance; his skin is stone hard, tinged blue-grey with pebbles scattered across its surface, and his hair is as stiff as steel wire. During Slayers Evolution-R, Rezo informs Zelgadis that he knows of no cure to return him to human. It is unclear whether this means that Zelgadis will forever remain a chimera, or if Rezo’s knowledge was simply limited in that respect; but Hajime Kanzaka, the author of the series, has stated in past interviews that Zelgadis would probably eventually find his cure.
Out of everyone in the group, Zelgadis seems closest to Amelia. This becomes more clear in Slayers NEXT, as he becomes upset whenever she is hurt, and almost sacrifices his own life protecting her from Gaav. In later seasons, they become quite close and he opens up to her. When they part at the end of the last episode of Slayers TRY, the third season of the anime, she apparently gives him “The Lady’s Favour” in the form of one of the pink bracelets from her standard costume.