Satoshi Inuzuka was a powerful, legendary Shinobi, who was once the head of the fallen village Jumogakure for most of his life--he started when he was seven, and ended when he was two thousand years old. He was one of the Seven Great Immortals, and the head of all seven due to his great power supposedly being far greater than the other six combined. He was the first known member of Konoha's Inuzuka Clan, and thus invented the technique that allows them to sinc with their own personal Ninja Hounds for combat. Due to this, he did have a group of Ninja Hounds of his own; eight, to be exact. Lucifer, Mephistopheles, Satan, Devil, Demon, Hellhound, Hellraiser, and Cerberus. Although Cerberus was undoubtedly the most powerful, that's not to denote the power of the others at all. Each one of them individually had Chakra that was comparable to the Biju, and all of them together were rumored to possess power far greater than that of Kurama, the Nine Tailed Demon Fox. He also possessed, during his long life, the spirit of the Fifty Tailed Demon Grizzly Bear inside of him as well, which he's supposedly perfectly mastered within a year.