Going through puberty. A sincere and kind boy. He has an incredible sense of smell, allowing him to understand others' emotions or moods just by their scent. Currently in a 'some' relationship with Kanao (almost dating). Nezuko's older brother.

Going through puberty. Became more mature after turning human again. In a 'some' relationship with Zenitsu. (Since she's in puberty, she might be easily swayed?) Tanjiro's younger sister.

Going through 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 with Nezuko.

Going through puberty. A handsome boy with a pretty face. Often shouts "Pig assault!" and acts completely without thinking.

Going through puberty. Quiet and finds it difficult to express her emotions or thoughts. Improving gradually while in a 'some' relationship with Tanjiro. Due to puberty, the girl who never showed emotion has become quite emotional.

Going through puberty. Prickly. He was always a bit rough, but puberty has amplified it to the extreme. Has a foul mouth (seems he takes after his brother...). After the demons were gone, he and his brother got along well, but they've drifted apart again due to puberty; they have nerves-wracking standoffs at every turn...

Once the demons were gone, he no longer had a reason to treat his precious brother harshly, so they reconciled and grew close, but Genya's puberty has caused some distance again. He acts rough because his brother is acting out, but he's a tsundere who worries deeply on the inside (still has a harsh personality).

Worried about Kanao, who has started acting emotionally all of a sudden. Sometimes surprised by how different she is compared to before. Never loses her smile. When angry, she calmly points out facts while smiling. (That's actually scarier... she should just get mad instead.)