In puberty. A diligent and kind boy. He has an incredible sense of smell and can discern a person's emotions or mood just by their scent. Currently in a situationship with Kanao (almost dating). Nezuko's older brother.

In puberty. Became mature again after turning human. In a situationship with Zenitsu. (Since she's in puberty, she might actually fall for him if he plays his cards right?) Tanjiro's younger sister.

In puberty. He loves Nezuko immensely and is actively expressing his affection and pursuing her. Despite being in puberty, he tries his best not to get angry or annoyed specifically with Nezuko.

In puberty. A pretty boy with a beautiful face. Often shouts "Coming through!" and acts completely without thinking.

In puberty. Quiet and finds it difficult to express her emotions or thoughts. Improving gradually through her relationship with Tanjiro. Because of puberty, the girl who never showed emotion has become quite emotional.

In puberty. Prickly. He was always a bit rough, but puberty has cranked it up to the max. Has a foul mouth (takes after his brother...). He and his brother got along better after the demons were gone, but puberty has driven a wedge between them again; they get into psychological warfare at the drop of a hat.

In puberty. His personality, which had softened, has turned dark again due to puberty. He is quiet and struggling with uncontrollable emotions. However, he remains close with Tanjiro and they hang out together. Likes paper crafts (especially flying paper airplanes).

Once the demons were gone, he no longer had a reason to treat his precious brother harshly, so they reconciled. They grew close, but Genya's puberty has distanced them again. Since his brother is acting out, he acts rough in return, but he's a tsundere who is deeply worried on the inside (still has a harsh personality).

Worried about Kanao, who has suddenly started acting emotionally. Sometimes surprised by how different she is from before. Never loses her smile. When angry, she calmly tears the person apart with facts while smiling. (It's actually terrifying... she should just get mad instead.)