Tonton

is Tsunade's pet pig, often kept in the care of Shizune.

Personality
Tonton does not speak in any human language, but still manages to get her point across by whining in her own unique tone (a "buhi" or "oink" depending on the language). It seems that Tsunade and Shizune are able to understand what Tonton is trying to say. Tonton's nose also seems adept at tracking things, so much so that Pakkun has some familiarity with her.

Appearance
Tonton is of a light pinkish colour, much like any other pig. Her cheeks blush in a darker shade of the same pink as her skin. She is always seen wearing a pearl collar and a dark red jacket.

Abilities
The only official ability Tonton has been shown in the manga to have is a keen sense of smell. Also, despite her small size, she has been shown to be strong enough to carry several crates at least as large as her.

In the video games, Tonton often acts as Shizune's partner in some of her techniques. In the anime, Tonton performed a Transformation Technique, appearing as Tsunade (although she did not speak). It could be that Shizune performed the technique on her, just like she does in the video games.

Search for Tsunade Arc
While travelling with Shizune and Tsunade, Tonton encountered Orochimaru and Kabuto, who were hoping for Tsunade to cure Orochimaru's arms. She is later seen on the battlefield watching the battle along with Gamakichi and Gamatatsu.

Mizuki Strikes Back Arc
Tonton was later seen during the escape of the criminals from the Konoha Strict Correctional Facility. She used her keen sense of smell to find the escapees until she was relieved of these duties by Pakkun.

Invasion of Pain Arc
Tonton was present when Naruto was informed of his master's death, with Shizune holding her in her arms.

Confining the Jinchūriki Arc
When Tsunade awakes from her coma, Tonton looks pleased to see her up until Shizune mistakenly believes that Tsunade wanted to eat Tonton to regain her stamina, much to their panic.

Shinobi World War Arc
Tonton is later assigned to the Logistical Support and Medical Division alongside Shizune. When Shizune introduces her to the division members she expressly tells them that Tonton isn't food. After the first day of the war is over, Tonton is seen helping around the barracks by transporting crates tied to her back.

Tonton is later seen being tended to by Shizune as she had sprained her right front leg from carrying too many heavy crates. This sprain is also used to trick a White Zetsu masquerading as Neji Hyuga trying to assassinate Sakura Haruno. White Zetsu Neji assumes Tonton is a ninja rather than a pig and makes a comment about "using jutsu" which tips off Sakura.

Trivia

 * In the video games Naruto: Ultimate Ninja 2, Naruto: Ultimate Ninja Heroes 2: Phantom Fortress, Naruto: Ultimate Ninja 3, Naruto Shippūden: Ultimate Ninja 4 and Naruto Shippūden: Ultimate Ninja 5, Tonton is used by Shizune in "Hog Release: Tonton", which is a technique that throws Tonton at an opponent while spinning upward. In Naruto Shippūden: Ultimate Ninja 4, Tonton is used as a partner to Shizune, helping her out in her Ultimate Technique by transforming into an image of Shizune and attacking the enemy to distract them from Shizune's main attack. In Shizune's "Chakra Sword: Great Intersecting Wound", Tonton butts the enemy in the stomach to knock the enemy back for Shizune's main attack.
 * In Naruto: Path of the Ninja 2, Tonton could be summoned to break rocks in the player's path.
 * Tonton shares the same voice actress in both English and Japanese versions of the anime as Shizune.