Kairi

Daughter of the Northmanni president. Madly in love with Arin and is unaware of Kato’s existence. She is very air-headed but lives life fully and is kind to everyone in equal measure.

 She's the secret assassin who Kato uses for his covert operations. Most of her body was destroyed in an accident before the beginning of the story and Her organs were replaced with machinery./

 She is Lira from an alternate timeline that she and Kato originated from. /