The biological parents of Rui; They were killed by him after he misinterpreted their intentions of killing him for becoming a Demon, when in reality they were trying to commit murder-suicide to atone for their son's sins.
The caretaker and biological parent of Hakuji. He was a kind-hearted man who suffered from a disease and raised Hakuji as a single parent. After hearing of his sons crimes, he committed suicide out of guilt.
The possible descendant of Tengen Uzui or his reincarnation; a good-looking, 20-year-old professional gymnast who won the gold medal in gymnastics during the recent Olympics. He is also noted to be somewhat of a punk, often flashing his middle finger and choking reporters.
Either the reincarnations of Sanemi Shinazugawa and Genya Shinazugawa or the descendants of Sanemi; they are police officers who nearly run over Sumihiko as he rushes to school. They soon give chase and go after him.
The reincarnation or possible descendant of Giyu Tomioka, and the reincarnations of Sabito and Makomo. The children can be seen discussing toy charms similar to the fox masks which were worn in their past lives. Giyu's reincarnation is named Giichi (義一,Giichi?).
High School Student
The possible descendant or reincarnation of Goto. He is a male student that attends the same school as Yoshiteru and can be seen admiring a painting of Tamayo.
Either the reincarnation of Kyojuro Rengoku or the descendant of Senjuro Rengoku. He attends the same high school as the Kamado and Agatsuma descendants. After catching up to his friend Sumihiko Kamado on his way to school, they run the rest of the way together, jumping the school gate and making it just on time. It is noted that he has a passion for kendo, often forgetting about everything else when he's training and participating in the kendo club at school.
Either the reincarnation or descendant of Murata. He is the principal of Toko, Yoshiteru, Sumihiko and Kanata's school and is seen trying to close the gate as Sumihiko and Tojuro rush to class.