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 tied back behind his head. He has fair skin and large, gold eyes that redden near the pupils. Senjuro is originally seen to be very sad and rattled by his brother's death and his father's verbal abuse, but, after some time, he is seen as kind and caring. Gentle. Modest.