Aogiri

Aogiri "Taro" (梧) is a human who is the third son of The Sage's Country's Emperor. Aogiri plans to become the next emperor, in order to make changes that will allow both vampires and humans to coexist in peace.

History
Aogiri was born to the emperor and his wife. Aogiri loved his mother dearly, but before she "left for her trip", she told him to not "become a ruler who's indifferent towards or who discard those in need". This stuck with him and always made him believe in trying to do the right thing. His maid Maya took care of him after his mother left. While growing up in the castle, he was brought up with stories that vampires are evil, blood-sucking monsters.

One day, he starts to question who and why his father was capturing so many prisoners, which Maya tried to get Aogiri to stop thinking about. This led to Aogiri to sneak underground, an area which was off limits to him. He then ran into a little vampire girl who would take him to the Scientist lab. There he saw a room full of women who were brought in as slaves. They had been enslaved for not obeying the soldiers orders. It was there he realised that the country had been enslaving innocent humans.

Afterwards, He then told his father that he was just as much of a monster as vampires and ran back to his room to find Maya in there. Guards showed up shortly for him to be brought to the Sages. Maya aided him in escaping, as she knew that if he didn't leave, he would be killed. While he was running away from the castle, he became severely injured and was found by Ai, who nursed him back to health.

Plot
One night, Ai found Aogiri severely injured and decided to take him to a safe secluded place. She healed his injuries as he recovered over the next couple of days.

In the beginning, Aogiri didn't trust Ai and therefore wouldn't reveal any information about who he was. Ai therefore gave him the name "Taro" while she was in his company. He played along with the story that he was a child slave when asked if he was. “Taro” eventually warmed up to Ai. He stated that she wasn't a monster, but that vampires and humans couldn't get along.

Once his injuries were healed, Ai introduced him to the resistance army base. Maria knew right away who he was and assessed if he was a spy. He stayed and assisted with the resistance's cause while keeping his identity a secret. During his free time he would think about his time with Ai and draw pictures of her, calling her his "Night Dew" (as he didn't know what her name was).

10 years later, he reintroduced himself to Ai and asked her to aid him in his quest to become the new emperor.

Trivia

 * He was best friend with Ai and only had a political marriage with her to help humans and vampires rebuild a society utterly damaged by his father.
 * Aogiri died peacefully in bed, with Ai holding his hand.