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 currently unknown, Utakata and the Six-Tailed Slug appear in a filler arc in the anime.

Personality
In the second Naruto artbook, Kishimoto described Utakata as "charming". In his drawn depictions, Utakata is usually depicted with a stoic expression, and the anime's depictions also show him with an emotionless look, although a clip of his appearance-to-come depicts him showing anger toward a young girl named Hotaru. She's a granddaughter of En no Gyoja, who is the master of a forbidden jutsu that can destroy an entire village.

Appearance
Utakata is a young male with dark brown, shoulder-length hair with amber-colored eyes. He wears a long blue kimono with an orange sash belt. He carries a bamboo jug which is filled with a soup solution inside his kimono that's tied on by his sash.

Abilities
Utakata fought using ninjutsu from the  of ninjutsu, using a unique kind of bubble-blowing relic. In the anime, it is shown he is able to stand inside the bubbles he blows and can float along inside them. He can also trap his enemies in his bubbles and kill them with his technique, Ink Bubble Explosion.

Trivia

 * refers to bubbles on the surface of a liquid. Idiomatically, it also means "transient," "ephemeral."
 * In an upcoming filler arc in the anime, Utakata and the Six-Tails remain yet to be captured by Akatsuki. 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.
 * In the anime, Utakata is shown dislike being referred to as a "master", saying he's not foolish enough to be referred as such.