Ocular Chakra Duplication

Ocular Chakra Duplication is a kekkei genkai ability of Natsumi Sora. Due to the extreme genetic makeup her body possesses, specifically her eyes, this allows her eyes to distinguish chakra by texture, feel, and color, as well as essense. As a result, her eyes can obtain the genetic information of another users chakra nature, and process it, causing her body to react and produce the observed chakra nature, allowing her to use it as if it's her own.

This kekkei genkai was thought to be a dojutsu, but it was later learned by Ace Korimachi and Niyya Korimachi that the ability didn't come from the eye itself, but from her retinas causing her body to produce the observed nature, intead of her eyes reproducing it.

From this kekkei genkai combined with the knowledge she obtained from several of Hexoshigakure's sealed forbidden chambers, she can transmutate the chakra she observes, as well as chakra that comes into contact with her. She has taken the ability to such an extreme that shes able to transmutate her entire body into another chakra type at will, giving opponents an extremely hard time trying to kill her.

Trivia
Because of this kekkei genkai, enemies in other countries were ordered to dispose of her without use of any unique kekkei genkai, out of fear that Natsumi would copy it and use it against them.

She is imfamously feared for this ability in the Lain of Rain, due to her 10 year killing spree of Amegakure Ninja. In turn, they gave her the nicknames "Empathy", and "The Amegakure Executioner.