Personality
Known as the troublemaker of the household, Ayato is an attention seeker and loves mischief. He looks down on others and loves to bully and tease people. He refers to himself most of the time as "ore-sama" and he calls Yui "chichinashi" (meaning breastless) at all times.
Ayato is quite the rebel and has a passion for torture device; like the iron maiden. Such device can be found in his room. He is also the type who always brags about himself; sometimes commanding everyone to call him 'Ayato-sama'. It is also noted that he eats a lot, although Ayato stated that vampires need to drink blood to savor the taste. His favourite food is takoyaki and gets very angry if someone eats his food.
He is a narcissistic prankster who has an obsession of being the best due to his childhood problems with his mother. Ayato is the youngest of the triplets along with Laito and Kanato. His mother, Cordelia, abused him a lot as a child. Ayato's actions is the mere reflection of Cordelia's harmful punishment and how he has been affected by it, why is why his cocky attitude can be compared to that of Cordelia's.
Ayato uses vulgar language at times. Ayato would insult his mother (even after her death) and his brothers by telling them off and calling them names (almost always giving other nicknames) like calling Kanato as hysteric and Reiji as tableware otaku. He also tends to be arrogant as he always calls himself the strongest and the best. And whenever things go his way, he acts unsurprised.
Ayato is very playful and loves sports; basketball being his favorite. Ayato has stated that anything is fine as long as there's a goal to reach for and that sports is his strong point.
Ayato has a hard time expressing his feelings and he tends to get quickly jealous of anything. Even when Yui manages to stand up to him or teases him in her own way he starts to act more high-and-mighty and tries to cover up his feelings of embarrassment. Due to his high pride, he usually misleads people into thinking that he doesn't care about things he really cares about. Ayato is also a pervert and very possessive, as enjoys seeing others suffer. He hates being told what to do and is impatient. When he wants something, he will spare no time to get it. He is also very vulnerable when it comes to takoyaki.
History
Ayato, along with his brothers Kanato and Raito, were raised by Cordelia when they were kids. Cordelia did not want children in the first place and saw the triplets as pawns to be used, especially Ayato. Cordelia neglected and treated the triplets so bad that it caused a negative effect on their outlook on life, especially love.
Ayato is the youngest of the triplets, with Raito being the oldest and Kanato being the middle triplet. Ayato got the least love, encouragement and freedom compared to his two brothers, because of their mother's never ending wish for him to study so he can become the best; even better than Shu, their father's successor who will become the future vampire lord of the underworld. Since Karlheinz has more than one wife, Cordelia developed a bitter relationship with Beatrix, Karlheinz's second wife. These results in both mothers using their sons to fight over the vampire throne. Shu was fortunately treated and loved very well by his mother. On the other hand, Ayato was only showered with harsh remarks, beatings and insults.
In his past, Cordelia was using Ayato to get Karlheinz' attention by forcing him to do things, such as studying to compete with Beatrix. Cordelia believed that Ayato can beat Shu and that he has a chance of becoming the vampire leader. But in reality she only wanted Karlheinz to notice her.
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Young Ayato
Ayato never had a happy childhood, despite the fact that he was shown having fun playing wooden stack and playing around with Kanato and Raito (before the three became who they are in the present). Cordelia's very harsh nature was first shown when Kanato's pet bat escaped. This turn into a game for the Sakamaki triplets. Unfortunately, Ayato's fun was ruined by Cordelia, who forcefully took him away to return home and study.
Ayato, being the rebellious child he is, went against Cordelia's command, earning him a slap in the face. This caused Ayato to feel very upset. He later on gets thrown in a water fountain by Cordelia as punishment, telling him to use this time to think about his actions and to cool off. Ayato couldn't swim back when he was young, which explains why he had trouble trying to stay afloat so he can breathe (although in the anime, it's shown that he knows how to swim when he tried to save Yui, who is revealed to not have the ability to swim as well).
His mother refused to help him, not even Richter, his uncle, who came into the scene moments later. During that time, Cordelia tells Ayato that she's done providing him with love and using him if he won't become the best. This lead to Ayato becoming a narcissistic person he is today. Through this punishment, he began to believe that a person "must never fail in order to be loved". It is also the time that he began to hate and resent towards his mother.
Although Raito and Kanato received some form of love but in a sick, unmotherly way, Ayato did not receive any. The triplets never got a sane motherly love. He was the only one out of Cordelia's sons who truly hated her. Ayato decided to kill Cordelia by stabbing and sucking her blood out of her body. Although Ayato stated that he hated everything about his mother, he loved her blood's taste, due to the fact that she was the daughter of the Demon King.
Ayato Sakamaki (逆巻 アヤト Sakamaki Ayato) is the fifth son of the Sakamaki household. Ayato along with Raito and Kanato, the triplets, are the sons of Cordelia, daughter of the Demon Lord and the first wife of Karlheinz, the Vampire King.