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 are stated to appear in an upcoming filler arc in the anime.

Personality
In the second Naruto artbook, Kishimoto described Utakata as "charming".

Appearance
Utakata is a charming young male with brown shoulder-length hair with amber-colored eyes. He wears a long blue kimono with an orange sash belt. He carries a scroll inside his kimono that's tied on by his sash belt.

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.

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.