Boar-Masked Anbu Member

He is an Anbu Captain from Konohagakure.

Background
In the anime during the Third Shinobi World War, he was apart of Danzō's Root group which traveled to Amegakure and allied with Hanzō, to eliminate the Akatsuki. After Hanzō's men captured Konan, he along with the rest of the Anbu stood beside Danzō and waited for the order to attack after her teammates had arrived. When the order was given, the group launched an attack but was repelled by Nagato's statue he summoned and was seamlessly defeated.

In the anime he, Kakashi Hatake and his partner came to the aid of a Konoha lookout that was getting attacked by a group disguised as Iwagakure shinobi, with the intention to create a rift in the peace treaty between villages. Soon after they arrived, the group retreated leading Kakashi to follow them and mercilessly kill all five of the shinobi before their group could collect intel from them.

He and his partner accompanied Hiruzen in infiltrating a secret bunker with the intention to find out who was behind the kidnapping of Anbu and jōnin in the village. After they disarmed the traps, they confronted the person behind the acts and discovered it was Orochimaru. Having been caught, the Sannin attacked the Anbu and Hiruzen and escaped. Afterwards, he and other Anbu were tasked by the Hiruzen to capture him alive if possible, before he left the Land of Fire.

In the anime, he and a squad of Anbu attacked and caught Hanare before she could infiltrate Konoha. After escorting her into the village, he handed her over to Ibiki Morino and the Konoha Torture and Interrogation Force to get information out of her. Later, he and his partner stood guard during a meeting between Konoha representatives and the Fire Daimyō. When someone interrupted the meeting, he and his partner immediately restrained the intruder.

Appearance
He is dressed in a white cloak and black trousers with bandages tied around his right leg and black sandals. He also has brown hair tied into a short ponytail, and wears a mask with a boar motif inclusive of three markings at the top and bottom of it along with markings around the mouth and eye-holes. In Part I, he wore the standard Anbu attire and wore a sword strapped to his back.

Abilities
He makes use of large scale Earth Release techniques to trap enemies by causing a large amount of mud to fall on the opponent that can be shaped and heated by another Anbu member or summon a large boar-shaped lid that can be dropped on enemies. He was seen using the Temporary Paralysis Technique while also probably being proficient in kenjutsu.

Chūnin Exams
During the Chūnin Exams, he and his partner went to retrieve Anko Mitarashi in the Forest of Death. After seeing that her cursed seal had resurfaced and hearing that she had encountered Orochimaru, he told her that martial law was to be implemented whenever he was spotted and as such the exams should not continue any further. After carrying her back to the tower in the middle of the forest, their attentions are drawn to a video by Iwashi. They then discuss the progress of the Sand Siblings to the tower, who are unscathed. After Kabuto Yakushi killed the Anbu stationed at Konoha Hospital which were gaurding Sasuke Uchiha, he, his partner and Yūgao Uzuki randevu'd at the hospital and discussed the matter with the Third Hokage and Kakashi.

Three-Tails' Appearance
In the anime, he and his partner were part of a Anbu team that was tasked to watch over the Three-Tails. After arriving and relieving Kakashi's group of watch, the group stationed themselves at the lake to write reports to send back to Konoha. While on watch, he and his partner were attacked by Deidara and quickly defeated.

Itachi Pursuit Mission
In the anime while patrolling Konoha's graveyard with his partner, Kabuto managed to sneak past the two and get the DNA of three shinobi from their graves, without alerting anyone.

Pain's Assault
During Pain's assault on Konoha, this Anbu captain worked in a three man team with two other Anbu captains in order to battle Pain's Giant Multi-Headed Dog summon. This battle is expanded on in the anime as they use their "Formation B" in order to halt the beast's advance and allow Shizune's group time to escape.

Trivia

 * Though he and his partner were believed to be killed in episode 112, they later appear during Pain's Assault.