Ranmaru's Kekkei Genkai

Ranmaru possessed a dōjutsu    kekkei genkai  which, when activated, causes his eyes to glow red in colour. It grants him abilities such as penetrative vision as well as the ability to hinder dōjutsu such as the Byakugan which his own dōjutsu has been likened to.

Overview
This dōjutsu grants the wielder many abilities that include penetrating vision, able to see clearly through an obstruction and from long distances similar to the Byakugan. At the same time, the kekkei genkai has the ability to counter other dōjutsu's visual prowess, as it blocked the ability to see chakra and even fool the vision of the "all-seeing" Byakugan. Likewise, it can perform irresistible genjutsu. Ranmaru's vision also lets him locate and track others by sensing chakra, picking up chakra from long distances, and noticing changes in an individual's chakra. It is also able to sense how many individuals are present.

Ranmaru's vision has heightened perception and analytical powers, able to comprehend any details he sees. When first encountering Raiga, Ranmaru was able to read his thoughts to determine what was ailing him. He can also see one's life force, which he can use to predict the opponent's next move or tell if someone was alive, well-beyond the Byakugan's power to detect life through their active chakra networks. In addition to this, Ranmaru is able transfer part of his own life force to completely heal someone who is mostly dead.

Trivia

 * Ranmaru's Kekkei Genkai fits the description of the Ketsuryūgan from Sasuke Shinden: Book of Sunrise. It is unknown whether the two dōjutsu are one and the same. The anime's depiction of this dōjutsu, however, gave clear difference in design between the two.



Додзюцу Ранмару Dōjutsu de Ranmaru Kekkei Genkai Ranmaru