Utakata

was a shinobi from Kirigakure and the jinchūriki of the Six-Tailed Slug. The Six-Tails has been captured and sealed by Akatsuki, causing Utakata's death when the beast was extracted. While the events surrounding his capture and death are unknown, Utakata was featured in an anime-only detailing his capture.

Background
Prior to the events of the Six-Tailed Beast arc, Utakata trained with an unknown master, who eventually betrayed him. After this, Utakata gained a fear of the relationship between master and student, and became a wanderer, constantly fighting off people who were after him.

One day, he was attacked again in front of a girl named Hotaru. While defeating his attackers, he was injured. Believing that Utakata had saved her, Hotaru took him to her family's fort for treatment. After he recovered, Hotaru begged him to train her in his ninjutsu, to which he refused, not wanting to become anyone's master. His dislike of the word 'master' came from a past experience when he was chained by his master, who then tampered with a seal on his stomach. This caused Utakata a great deal of pain.

Personality
Kishimoto described Utakata as "charming." Utakata is usually depicted with a stoic, emotionless look. The only time he has shown any emotion at all, that emotion being anger, was from his desire not be called, later saying he is not foolish enough to be titled "master." Utakata is a loner who shows no emotional attachment, yet has a strong sense of honor, and is determined to repay his debts to others. Tonbee also commented that he lacked "greed".

Appearance
Utakata is a tall, thin young man with dark brown, shoulder-length hair and amber-colored eyes. He wears a long blue kimono with an orange sash belt, sporting a small crest near the back of his neck that appears to be a simplified image of three bubbles. He carries a bamboo jug which is filled with a soap solution.

Abilities
Utakata fights using ninjutsu from the  of ninjutsu, using a unique kind of bubble-blowing relic. In the anime, this style of ninjutsu is shown to be very versitile having many variants that can be used for distraction or offense. He can also use the bubble as a means of transportation. In battle he was shown to be highly evasive, effortlessly dodging all of Naruto's attacks and dozens of kunai from Nangō, Akaboshi, Benten, and Chūshin. He as also very observant as he noticed that Akaboshi and his group had a change in their chakra flow.

Six-Tailed Beast arc
Wishing to repay the debt of having his life saved, Utakata agreed to make sure Hotaru and her grandfather's secret jutsu would safely be delivered to her clan's village.

Along the way, though, he met Naruto Uzumaki and his team, who had also been assigned to protect Hotaru. Seeing that the Leaf ninja were strong, he felt that he could trust them to guard Hotaru without him, freeing him from his debt. He then left, despite Hotaru's pleas for him to stay, as he noted that he was not foolish enough to want the title of.

Later on, he was seen resting under a tree, eventually falling asleep and having a dream regarding his past with Hotaru at the fort, which turned into a nightmare about his own master's betrayal. Shortly after awaking from this nightmare, Utakata spotted a flicker of a shadow, and decided to investigate. He came across a group of bandits, none other than Akaboshi's team, who were talking about the forbidden jutsu. Utakata confronted them and mused about taking the jutsu for himself, if it was so tantalizingly powerful. He then proceeded to fight them, easily besting them and their jutsu, until, however, they cornered him with a barrier, which then exploded with Utakata still inside.

Trivia

 * refers to bubbles on the surface of a liquid. Idiomatically, it also means "transient," "ephemeral."
 * In the anime, Utakata and the Six-Tails remain yet to be captured by Akatsuki, as the sealing statue wasn't shown having 7 of 9 eyes yet (2 others had to be captured in the manga). In order to avoid conflict with the manga, it seems inevitable that, by the end of the arc, Utakata will have been captured and the Six-Tails extracted, resulting in his previously-unseen death, in a manner similar to the Three-Tailed Giant Turtle.
 * His yet-unnamed musical theme is a remix of Guren's theme.