Dodai

is a Kumogakure shinobi.

Background
During the Third Raikage's tenure, Dodai instructed a select group of children, informing them that only one amongst their number would earn the name "B" and become A's tag-team partner in order to protect the future Raikage. He then instructed them on how to perform the Double Lariat on a training dummy, while indicating that the result would reveal their capacity to fulfil the duty of "B". As the prospective candidates failed one after the other, he lamented that the day seemed as though it would end in failure, until he observes A and a young Killer B decapitate the dummy.

Appearance
In his youth, Dodai had short and spiky, dark-coloured hair that was largely obscured underneath a stylised forehead protector in the form of a hat. Along with this item, his typical attire consisted of the standard outfit of most Kumogakure shinobi including the distinctive single-strap flak jacket, as well as an eye patch worn over his left eye.

In his old age, the contours of his face have become more pronounced and he has grown a small goatee. He wears the high-collared variant of the Kumogakure outfit along with flak jacket and his signature forehead protector. His eyepatch now has the stylised kanji for inscribed upon it.

Nature Transformation
Dodai possesses the Lava Release kekkei genkai, allowing him to combine both fire and earth natured chakra, which he can use to create a resistant, rubber-like substance as seen with his technique, the Lava Release: Rubber Wall. Unlike the other known users of the Lava release, Dodai is not only shown to emit the substance from his mouth, but is also able to create it externally.

Shinobi World War Arc
During the Fourth Shinobi World War, Dodai was assigned to the Fourth Division where he fought against several resurrected shinobi, including the Third Raikage whom he had once served under. While confronting the Third, he revealed the strengths and weaknesses of his deceased superior to the other members of the division, before asserting that to adequately counter the Raikage's endurance they would require a far stronger wind release technique than previously used. When later asked by Temari, he recounted the story of how the Third had died.

After observing Naruto's arrival and the Third's evasion of his Rasenshuriken, Dodai tells him that the Raikage won't be hit while using his Lightning Release Armour. However, when the attack finally collides, Dodai is more surprised by the Third's terrifying rate of recovery. Informing the division of his suspicions about the Kage's strange behaviour, he urges the others to disperse when the Raikage begins charging his strongest technique, before instructing the Earth Release users to prepare a defensive wall that he himself later reinforces with his Lava Release: Rubber Wall technique. Retrieving Naruto, he details the Third's technique and comments upon the foolish attempts of some shinobi to attack the Raikage as he breaks through the wall, in spite of his warnings. As Dodai continues his explanation, Naruto asks how the Third received his scar despite his resilience and so, he describes how the Third confronted the Eight-Tails alone but never disclosed the specific details to anyone.

Trivia

 * "Dodai" can mean either or  in Japanese.
 * The kanji for inscribed upon his eye-patch, is the same stylised kanji that the users of Black Lightning tattoo on their shoulders to signify their possession of this ability.