Oyuki

Natsumi Oyuki is a major supporting character in the manga/anime series, Demon Kings. She is the lover of Toshin Enishi, a Demon of Makai. Oyuki is a descendant of the enlightened humans hailing from the Astral Plane, making her from the same breed as Naraku Minamino. She first met Enishi after saving his life by sucking the poison out of him. Although Enishi initially resented Oyuki, her reserved personality and calm nature eventually won him over. Not to mention Enishi genuinely felt bad for her when learning of the cruel treatment she suffered from her parents. Oyuki values Enishi as the greatest person she has ever met, due to the fact that he tells her things about himself that nobody else is aware of. Oyuki's goal is to help Enishi find his own happiness. Her death sparked Enishi to find his resolve in life, which ultimately led to her resurrection through his Ceremonial Rebirth plan, as well as his own death. Oyuki later on takes the role as a messenger from Makai and Ningenkai.

Personality
Oyuki is described by Tarou as being somewhat reserved, and extremely respectful. She is kind person, who treats her friends and enemies kindly. Oyuki is also shown to be quite observant, and focused, determined to go to great lengths to get what she wants. This was shown in her backstory when she refused to leave Tarou's side until he was completely better, even sucking the poison out of his lip. Oyuki's gentle nature is shown to be the base of the Earthbound Royals, something they all value. She, like Tarou, is quite close to every member. Among the team however, Oyuki appears to be closest with Touya, whom she interacts with frequently, and share jokes with one another, and Kurama, who she talks to about more personal female stuff (i.e. bust size, attractiveness). Oyuki is extremely close to Tarou, and his by far his closest ally. The two have a lot of history, which developed into an unlikely friendship, and then into a romantic affair. Oyuki's personality can change to a cold and calculating fighter when it is required of her, or when she witnesses something traumatic, such as the death of one of her friends. After her resurrection, Oyuki has acted as a messenger from the deepest pits of the Demon World, so that she could hear back from Tarou. This role of hers helped her develop a strong bond with Ginta Hanabishi.