Despite his aloof and stoic nature, Giyu is shown to be protective and caring towards those he is close to and considers his friends. This is first shown when he puts his life on the line for Tanjiro and Nezuko by vowing to commit seppuku if the latter were ever to eat a human, Giyū Tomioka is an ISTJ personality type. He is logical and loyal by nature. Trustworthy and steady, Giyū Tomioka has an unmatched sense of duty and he follows through on his plans.