Shinji has brown eyes and jaw-length blonde hair with a straight cut and many of his facial expressions reveal his upper teeth. Shinji appears to have a round ring pierced in the middle of his tongue.

 he wears a standard Karakura school uniform, though he usually wears trousers, shirt and tie, often supplemented by a newsboy cap 

Shinji's Zanpakutō is Sakanade the pommel becomes a large ring that allows Sakanade to rotate around his hand, blade is straight and slim, ending razor-like edge.