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Karen Kisaragi (sister)
Hayato Kisaragi (如月 ハヤト Kisaragi Hayato) is the male protagonist of Hundred. Originally from Yamato, Hayato became a Slayer in order to obtain state-of-the-art medical treatment for his sister. He has the highest known compatibility with a Hundred and his Hundred takes the form of a sword and a shoulder guard.
Although his height is not specific, it can be obviously distinguished that he is reasonably tall, much like Fritz's height. He has black feathered hair and red eyes. When in his Variant state, there is a little difference in his appearance that is shown in every episode when he enters his variant state. Within this state his eyes turn yellow, reflecting the colour of the Savages, and his teeth sharpen.
Hundred and AbilitiesFlying Swallow (ツバメの飛行 Tsubame no Hikō): Hayato's Hundred was given to him by Char which is a chevailer type that takes form a sword and a shoulder guard. Even on his first try, Hayato was able to master his Hundred.  which amazed Emile and Char.
- Full - Body Arnament: Due to being infected with the Savage Virus. While fighting Claire Harvey and almost being defeated , the Savage Virus made him enter his Full Body Armament which was an achievement cause he just got his Hundred.
- Energy Barrier: While in his Hundred form, Hayato is able to create an energy barrier allowing himself to protect from attacks as shown when battling Claire. 
- Energy Blast: Hayato is capable of channeling all his energy into his sword and created a huge blast on his opponent.
Variant Abilities: Due to being infected the the Savage Virus, Hayato is classified as Varient. Because of this, when in his Varient state he can aquire immense amount of energy, allowing him to strengthen the effectiveness of his attack.