Demaru Clan

Strongest in the Leaf
The Demaru clan started off from Jugo's Clan. Jugo's Clan and another similar clan had strange abilities, they were both able to transform themselves into strange demonic creatures. These two clans got along great, they eventually joined together and came one clan. During the Second Great Ninja War, the two clans got split up again into three, two of them the pures and the other one was the Crossbred Children. The Crossbreeded Ninja became known as the Demaru clan who had more control over their powers than anyone, and were considered the Strongest Ninja out there. Eventually these Ninja were able to join the Leaf Village where they evolved as a clan, the Strongest Clan in the Leaf Village.

Demaru's Corruption
Demaru's story is that of around 2 years within Konohagakure, a year ago, the Demaru faced betrayal by their Leader/Founder. Kaisen Demarus was a malevolent and greedy Leader. He wanted more control over everything, no matter what the price may be. After living for a year in Konoha, Kaisen decides to take over the Leaf Village. As soon as he brought up the topic, his clan members refused, and rejected it. This rejection angered Kaisen to the point of Betrayal, Kaisen tried to kill all of those who opposed him! Kaisen the strongest ninja in the village, and could not be beaten by anyone but his own kind, and even then it took all 12. Eleven, led by Serian Demaru(Kioshiro's sensei as well as Konoha Military Strategist).