Mangetsu Hōzuki

was the older brother of Suigetsu Hōzuki. Both Mangetsu and Suigetsu trained with the intention of becoming members of the Seven Ninja Swordsmen of the Mist together. This dream acted as their motivation for them both to complete cruel missions day by day. However, their ambition was cut short by Mangetsu's premature death. Mangetsu was able to achieve his goal of becoming a Seven Swordsman before death, however, and mastered all seven of the swords.

Abilities
Mangetsu was a very talented swordsman, having been accepted into the Seven Ninja Swordsmen of the Mist before his death. According to his younger brother, Suigetsu, he was called the 'Second Coming of the Demon'. His skill, power, and chakra were as such that all the blades, including Samehada — which is notoriously picky about who wields it-allowed him to wield them. He even had a scroll that would keep the swords sealed inside them, if they were with their current wielders.

Nature Transformation
Little else is known about his jutsus, but he seems to be a Water Release user like his brother. He was shown using what appeared to be the Hydration Technique against an Allied Shinobi Forces ninja.

Shinobi World War Arc
Mangetsu, as well as his fellow Swordsmen, were summoned by Kabuto Yakushi to fight Kakashi's division in the Land of Hot Water. After a combined attack from the shinobi forces proved fruitless against them, just destroying the coffins they came out of, and summoned the swords for his fellow swordsmen. Then they engaged in battle, and Mangetsu was found over a dead shinobi, using the Hydration Technique.

Trivia

 * means "full moon", and is the Japanese word for the "chinese lantern" or "winter cherry", a fruit which resemble Chinese paper lanterns; like all members of the Seven Ninja Swordsmen, his surname is derived from a type of produce.