Rommel trained as a sorcerer under Earl Nidol Migam in Falmuth, attending its Magic Academy. Initially assigned to oversee the Frontier Expedition Force, he transferred his allegiance to its captain, Youm, captivated by Youm's dominance and charisma to pledge eternal loyalty. This decision reshaped Rommel's path, leading him to serve continuously as Youm's advisor and secretary, a role he maintained even after Youm ascended to the throne of Farmenas.

He appears as a young man with medium-length dark brown hair tied in a ponytail, blue eyes, and thick glasses, typically dressed in wizardly robes. He wields a magical staff, especially in combat.

Rommel exhibits a timid, shy personality and struggles with social interactions, yet proves reliable under pressure. Portrayals in *The Slime Diaries* reveal additional facets: a mischievous streak and possessive tendencies, exemplified by his activity writing a story titled *The Beautiful Monster Princess Rimuru*.