Yashiro Uchiha is the only known member of the Uchiha clan whose hair is not visually black. Despite his old age, Yashiro is one of the top-ranked officers in the Konoha Police Force. It has been seen through flashbacks in the anime that he did not get along well with Itachi. Some of the reasons are that he thought Itachi was a show-off and had an easy time getting into ANBU. (Source: Narutopedia)
Teyaki Uchiha (ã�†ã�¡ã�¯ãƒ†ãƒ¤ã‚, Uchiha Teyaki) was a member of the Uchiha clan at the time of the Uchiha Clan Massacre. He was the husband of Uruchi Uchiha. Teyaki was the shopkeeper of the "Uchiha Senbei" (ã�†ã�¡ã�¯ã�›ã‚“ã�¹ã�„) shop, the purveyor of senbei to the Uchiha clan. His shop had been in the family since the rise of Konoha. The recipe of the senbei that gave the shop its fame was a secret passed down through the generations and was closely guarded by Teyaki. He was one of the few people that encouraged Sasuke Uchiha to be a great shinobi on his own, instead of praising only Sasuke's older brother Itachi. He was eventually killed by Itachi during his massacre of the Uchiha clan.
Saiken, more commonly known as the Six-Tails or Rokubi, is a tailed beast sealed within Utakata of Kirigakure. It was captured by Pain in the anime then extracted and sealed by the Akatsuki. (Source: Narutopedia)
Musai is a Kumogakure shinobi. During the Fourth Shinobi World War, he and Nonota were ambushed by a reincarnated Toroi. Recognising his fellow Kumo shinobi, Musai tried to alert Nonota about Toroi's techniques, but they were attacked before he could finish. After Nonota was magnetised, he further explained Toroi's abilities. Both are saved by the arrival of Naruto Uzumaki and Killer B, Naruto slamming a Rasengan against Toroi. Musai explained how they were headed to Headquarters when they were separated from F and the others, only to be shocked by B, who revealed that F was actually a transformed White Zetsu. In the anime, after they left, Musai and Nonota were briefly suspicious of the other being a transformed White Zetsu as well, before realising the enemy tried to kill them both, meaning they were both on the same side. They laughed it off, and then Musai joked, pretending to be a transformed White Zetsu, only for Nonota to slash his nose with a kunai in defence. He and Nonota later met up with their regiment while carrying Toroi, after explaining how Naruto and B had saved them, Torune arrived and summoned a group of Kabuto's "failures" to retrieve Toroi and the Third Raikage, among them was Musai's father Osoi, who he noted to a comrade had never made it past chūnin much to his father's annoyance. After promising his father to tell the Raikage he and Toroi had died fighting for the sake of the village, they said goodbye as his father was sealed. (Source: Narutopedia)
Shamon was the Second Kazekage of Sunagakure. He was the first to research the jinchūriki, in an attempt to greatly enhance the power of the village. (Source: Narutopedia)
Byakuren was the First Mizukage who founded Kirigakure in the Land of Water. (Source: Narutopedia)