Mifune

is the of the Land of Iron, where the Kage Summit took place. He later joins the Allied Shinobi Forces where he is assigned to be General of the Fifth Division.

Background
At one point in the past Mifune fought against Hanzō. During their battle Hanzō's kusarigama broke through Mifune's sword and struck his head. With the battle finished, Hanzō left assuming Mifune had died.

Appearance
Mifune has long gray hair with bandages wrapped around his head. He has black eyes with three distinct wrinkles under each. He also has a gray goatee that falls to his chest. On his debut, he was seen with a simple purple kimono-like outfit, but when the Fourth Shinobi World War began, he wears a samurai armour.

Personality
Mifune is a calm and level-headed person who hardly reacted even when Danzō Shimura was found to be manipulating him. During the conferences with the Kage he is generally the one who keeps the meetings productive and on track, usually by using his lack of association with Shinobi and their past conflicts to act as a neutral mediator. As he clashed with a resurrected Hanzō, he addressed him with much respect, intent on fighting him.

Abilities
As the General of the samurai, Mifune has command of the rest of them and, by extension, is a highly capable leader. Like them, he is also capable of channelling chakra through his sword to increase its cutting power. Despite his old age, Mifune has also shown great agility for his age as shown from jumping high into the air to reach Sasuke. He is also a masterful swordsman, able to judge and acknowledge Sasuke's swordsmanship in one clash.

Mifune is also a master of Iai to such an extent that Hanzō remarks that his skill with it renders ninjutsu useless, due to the fact that he can attack in the time it takes to form hand seals.

Five Kage Summit Arc
Mifune greets Gaara upon his arrival in the Land of Iron. Mifune states that he is the moderator as the meeting of the Kage commences, during this meeting Mifune also voices that he should be respected as the neutral party in the event that an alliance between the five Shinobi Nations is formed.

Mifune proposed that Danzō should lead the five-village alliance to deal with Akatsuki, to the shock of the other Kage, because Konohagakure has the only remaining jinchūriki. However, Ao suggested that Danzō is using his Sharingan to control Mifune. After Zetsu interrupted the Kage meeting, he ordered two of his men, Okisuke and Urakaku, to locate Sasuke Uchiha at all costs. Later he reprimanded Danzō for using the Mind-controlling Dōjutsu, as the use of ninjutsu was forbidden during the meeting.

Later, when Sasuke infiltrates the summit, he watches as White Zetsu is attacked by the Fourth Raikage. He is present when Sasuke finally reaches the meeting room, and is the first to attack him using impressive speed and jumping ability. He manages to surprise Sasuke with his sword attack, but it is nevertheless deflected. Mifune compliments Sasuke on his sword skills.

After Madara retrieved Sasuke and revealed his plan to unleash an "Infinite Tsukiyomi" on the world as well as a declaration for the Fourth Great Ninja war, Mifune promises to aid the Five Great Ninja nations in the battle against Akatsuki.

Confining the Jinchūriki Arc
Mifune attends the meeting called by the Fourth Raikage, bringing along Okisuke. He started the meeting by addressing the matter of the two remaining jinchūriki and information about the enemy's headquarters, strength and various things. He also reminded the Kage about their unity that will bring them victory.

Upon the news of Kisame Hoshigaki had infiltrated the jinchūriki's hiding place, Mifune participated in talking about the solutions to take. He commented that it is necessary to send a small elite force as the backup, because too large a force will be discovered by the enemy. It was agreed on that the Tsuchikage should go to the island as reinforcement.

When the Tsuchikage returns from the island, the last meeting is held in order to fully prepare for the war. Mifune comments that the victor will be determined by who strikes first. When the Tsuchikage received his Allied Shinobi forehead protector from the Kazekage in preparation for the war, Mifune comments that he personally designed it. He also says that the shinobi who have been divided will fight as one and samurai will join forces with shinobi.

Shinobi World War Arc
Mifune is appointed as the commander of the Fifth Division of the Allied Shinobi Forces. He is later seen telling one of his samurai to have a segment of the Fifth Division help the Second Division against a portion of the White Zetsu Army. After receiving instructions from the Intelligence Division, Mifune and a small team moves out to help the Surprise Attack Division. Right when a paralysed Kankurō was about to be killed by Hanzō, Mifune arrives and blocks his attack stating he wishes to fight him.

Trading banter, the two engaged in a brief, but fierce duel, Hanzō trying to keep the distance with his kusarigama. During their talk during their duel, Mifune began realizing his opponent had gotten rusty while his skills with the blade were sharper than before. Preventing Hanzō from using hand seals with Iaidō, Hanzō tried to suffocate him in the poisonous mouth of Ibuse, his salamander by swallowing him whole. Mifune countered, slashing through the salamander's head while Hanzō moved in for a final blow. In a complete reverse of their first battle years ago, Mifune cut the blade of Hanzō's kusarigama in half and slashed through his body.

Trivia

 * The name Mifune is often used for samurai or rōnin characters. It comes from the famous Japanese actor Toshirō Mifune, who made a name playing in over 170 feature films, often portraying samurai and rōnin roles. Some of the films he played in are Akira Kurosawa's Rashōmon, Seven Samurai, Throne of Blood, Yōjinbō, and Hiroshi Inagaki's Samurai Trilogy.