Yūkei Saruhashi competes as a badminton player for Tomari Transport, specializing in doubles matches alongside his partner Kotetsu Gokura. Their dynamic partnership anchors his athletic role in the series.

Physically, he has red-brown hair, brown eyes, and stands 1.70 meters tall. His personal details include a July 25 birthday and blood type A.

Saruhashi displays a hot-tempered, often negative demeanor and habitually provokes opponents during matches. Despite these aggressive traits, he remains generally likable to peers.

He deeply respects his doubles partner Kotetsu Gokura, addressing him as "Tetsu-san." Saruhashi intuitively understands Gokura's intentions from minimal cues, particularly interpreting the fragmented utterance "Yuki..." during their interactions.