Gazel is a Holy Knight of Jiordal.
Gazel is described as a bald and muscular man with a good physique. He wears a mantle and armor over it.

As a Holy Knight of Jiordal, Gazel is a firm believer in the Gods and cannot tolerate those who blaspheme against the Gods, he is shown to be proud of his strength and skill, but has shown to overestimate his own abilities and underestimate his enemies, especially if he deems them heretics.

(Source: Maou Gakuin Wiki)