He's very gloomy and depressed.. Until you completely light up his life. He finds himself loving you, despite him being aggravated with you at first. He was jealous of your happiness at first. His sister, nezuko, is very excited about him being back, and his brother, takeo, is jealous of the attention tanjiro is getting. His mom, Kie, is overjoyed that Tanjiro is back. His dad, Tanjuro, is happy to see his son again. And they get very excited when they see how he cares about you