Enoki Shintarou attends Tottori Hakurou High School and belongs to its sumo club. He possesses pale skin, calm black eyes, and long black hair featuring two prominent bangs framing his face. In competition, he wears the team's dark blue mawashi with a light green stripe on the left side.

Trained alongside teammate Shido Tennoji since middle school at an Osaka dojo, Enoki almost quit sumo five years ago, feeling outmatched by peers. Shido identified his strong wrists, effective frontal defense, and quick recovery after falls, advising him to incorporate aikido techniques instead of relying only on conventional sumo. This background forged his technical fighting style, leveraging his aikido black belt to disrupt opponents' balance using wrist locks and swift positional changes. His tactics involve feinting direct charges while subtly altering angles and timing to exploit momentary reaction delays.

Standing 174 cm tall and weighing 82 kg, Enoki's relatively small size for sumo leads him to prioritize technique over raw power. A recurring weakness is his mental focus, as he often rushes matches to finish early—particularly to advance Shido's opportunities in team competitions. During the Inter High Tournament, he defeated Shinya Ozeki by reversing a throw through a leg-grabbing maneuver that provided crucial leverage. He is observant of elite competitors, seen monitoring interactions between top wrestlers like Shido and Sōsuke Kuze.

His blood type is A. His name derives etymologically from "hackberry tree" (榎, Enoki) and "advance, thick/great, son" (晋太郎, Shintarō).