Senjuro has a similar appearance to his brother, Kyojuro Rengoku, and father, Shinjuro Rengoku, possessing unruly golden hair that flares out around his face, becoming red near the ends above his ears and shoulders, that he wears messily tied back behind his head. Senjuro is originally seen to be very sad and rattled by his brother's death and his father's verbal abuse, but, after spending some time talking to Tanjiro Kamado, his true personality as a kind, caring individual who can usually see.