Akifumi is a man who was able to see youkai when he was young. One day, he met Hotaru and fell in love with her. They spent their days having fun and playing near the lake. But even after he lost his ability to see youkai, he kept coming to the lake in order to find Hotaru again.
Santo had made his friend Mikuri very angry, but he doesn't remember the reason, because of that he had been sulking on the train station. When Reiko met Santo she promised to accompany him on his way to Mikuri the next day, but she never came to Santo since that day.
Lord Mibu gathered performers to play in Isozuki's Forest. Asagi is a koto player serving Lord Mibu who contracted a sickness which caused her body to dry up and crumble to dust. Since she could no longer serve Lord Mibu, she left the forest (of her own accord) and "Janome,", her umbrella-holder and bodyguard, carried her with him, in a special gourd. She is able to possess people and this slows down the sickness, so Janome assists her, though somewhat against Asagi's will, in finding a host. Janome/Akagane is trying to get Natsume to cooperate, so that Asagi can play for Lord Mibu in Isozuki's Forest one more time, when the full moon will expose the path to the forest. In reality, Asagi just wants to play for Janome, who loves her and has taken care of her and protected her for so long.
Hishigaki is one of the two youkais that have been chasing Natsume until he found the shrine where Madara was sealed. After discovering the Book of Friends, Natsume returned Hishigaki's name.
One of the Donquixote Family's officers. She was abandoned by her mother at a very young age for being useless, which shaped her personality to this day. She cannot turn down requests, she is happy when people need her, as she was proposed 7 times by men with ulterior motives and she agreed instantly. Those men have since been killed by Doflamingo. During the battle of Dressrosa, misunderstandings during her fight with Sai lead her to believe Sai is proposing to her. After seeing her being unable to turn down any requests, Sai vowed to maker her his wife and defeated Lao G.
A teacher who likes to be on time and likes things to be organized and be just right. (Source: TV Tropes)