Izuna Uchiha is Madara Uchiha's younger brother. He was alive about 70 years before the start of the series, even before the founding of Konoha. Standing at the top of the Uchiha clan with his brother, Izuna was one of the first to obtain the elusive "Mangekyou Sharingan" (along with Madara). However, Madara went blind due to the use of his. To alleviate this, Izuna gave up his eyes so that Madara would obtain a new, "permanent" Mangekyou.
Toroi was a famed Kumogakure shinobi. In preparation for the Fourth Shinobi World War, Toroi is reincarnated by Kabuto Yakushi to fight against the Allied Shinobi Forces, before being mobilised alongside Gari, Pakura, Haku and Zabuza Momochi. Separating from this group at some point during their relocation, Toroi is later discovered trailing Musai and Nonota, with numerous shuriken in hand and scroll in mouth. Identified by the Kumo-nin, who attempts to alert his ally to the best method to not fall victim to his Magnet Release, Toroi goes on the offensive. Despite the pre-emptive warning, the unaware Suna-nin still falls foul of the attack and is evidently terrified as the details of the technique are disclosed. Prepared to conclude the battle using even larger shuriken, Toroi is ambushed from behind by Naruto Uzumaki wielding a Rasengan, before being sealed by the previously panic-stricken Suna-nin. Later, with the release of the Impure World Reincarnation technique, a light of sorts encased Toroi's sealed body as the technique was dispelled and his soul was returned to the afterlife. (Source: Narutopedia)
Kyuusuke (鳩助, Kyūsuke) was once a shinobi from Amegakure and one of the original founding Akatsuki members. (Source: Narutopedia)
F is a Kumogakure shinobi. During the Fourth Shinobi World War, F was attacked by a White Zetsu Army clone on the battlefield and was later impersonated by this clone. It is unknown if the real F is still alive. (Source: Narutopedia)
Hiruko (�留呼) is the main antagonist of Naruto Shippūden 3: Inheritors of the Will of Fire. He is a missing-nin of Konohagakure who wishes to plunge the world into a Fourth Great Shinobi World War, and then conquer it. Though he was born with no natural special abilities, Hiruko compensates by using the Chimera Technique, a kinjutsu which he developed, allowing him to obtain Kekkei Genkai by integrating the bodies of other ninja with his own. Having already stolen four Kekkei Genkai from the other Great Nations, Hiruko possesses other abilities and physical traits from his victims, such as enhanced strength, and seeks to obtain more. In addition to these abilities, Hiruko and his followers are able to use the Chimera Technique to produce creatures that are literal chimeras, including a large, bird-like monster that molts explosive feathers and wolf-like beasts that attack using appendages resembling tentacles. Through his Chimera Technique, Hiruko has acquired four Kekkei Genkai: Steel Release, Swift Release, Dark Release, and Storm Release and also an Unnamed Three-eyed technique. It is unknown if he acquired more. In addition to this he also has a section on the palm of his hand where he can literally "absorb" the technique being thrown at him. (Source: Narutopedia)
Birthday: July 21 Kotetsu Hagane is a Chunin from Konohagakure. He spends most of the time with his partner Izumo Kamizuki watching who enters and leaves at Konohagakure's Main Gate.
Shukaku is the demon that is in Gaara giving him most of his power and his insanity. Shukaku is able to fire off sand chunks that look like and act like kunai. In the English dub, Shukaku is made sounding like an insane cowboy. Shukaku is the Ichibi, which is the One-Tail Jinchuriki. Shukaku is very powerful as Gaara can still not fully control him.