Template:Infobox/Naruto/Genetic <section begin=summary />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 other dōjutsu such as the Byakugan which his own dōjutsu has been likened to.<section end=summary />
This dōjutsu grants the wielder many abilities that include penetrating vision, disruption of other dōjutsu, and unique healing through life-force energy manipulation.
With his kekkei genkai, Ranmaru has the ability to see and hear things from long distances. With this ability, Ranmaru was able penetrate the walls of his shack to view the outside world. Although the range of his kekkei genkai is similar to the range of the Byakugan, it actually has the ability to counter and negate that trait. His abilities also allow him to perform irresistible genjutsu, which can fool even the "all-seeing" Byakugan. 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, similar to those of the Sharingan, meaning he can 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. In addition to this, Ranmaru is able transfer part of his own life force to completely heal someone who is mostly dead.
- Ranmaru's Kekkei Genkai fits the description of the Ketsuryūgan from Sasuke Shinden: Book of Sunrise. It is unknown, however, whether the two dōjutsu are one and the same.