Tanjiro is kind by nature and has been described by others as having very gentle eyes. He has a great deal of determination and will not give up once he has a goal to achieve, as shown in his relentless quest to find a cure for Nezuko, who was transformed into a demon. Although deep down there is a growing rage and vengeance inside of him, Though Tanjiro does have a limit to his tolerance and has a distaste for rudeness and cowardice, he is also very protective of his friends and little sister.