Sanemi is a tall muscular man with large sharp eyes similar to his younger brother Genya Shinazugawa. He has short spikey white hair and pale purple eyes. He wears the standard Demon Slayer uniform with his shirt unbuttoned showing his many scars on his chest. He's usually abrasive, hot-blooded, short-tempered, indifferent towards others, impulsive, rash, strong, clever and stubborn. He doesn't know how to express his feeling clearly.