Kiseru Gankubi

is a shinobi of Konohagakure.

Background
At some point, Kiseru was helped by Konohamaru Sarutobi.

Personality
Kiseru is a feisty and determined individual, refusing to give up trying to escape despite making no progress. He is compassionate, readily collaborating with Boruto to help the civilian captives survive Ōga's experiments, and urging Boruto to remain positive after some of them died, stressing they did all they could.

Appearance
Kiseru is a fairly tall child of tanned complexion. He has dreadlocks reaching his shoulders tied in a ponytail. He also has stern eyes with blue irises and thick brows. He wears a white undershirt, a grey vest, and grey pants with black sandals.

Abilities
Kiseru is able to use Fire Release, and can jump several feet in the air quite easily. He has great stamina and pain resistance, attempting to break out of his confinement for quite a while, and being unbothered by his swollen hands after trying to punch his way out. He is also good at improvisation, using the railing of a safe platform to create a ladder.

Labyrinth Game Arc
While on the Thunder Train, Kiseru and all other passengers fell asleep and woke up detained in a secluded room. Kiseru attempted to break out by attacking the walls with Fire Release and taijutsu, with no results. He recognised Boruto, identifying himself as a fellow Konoha-nin. Ōga revealed himself as their captor, and announced he'd put them through experiments to test their ability to avoid death, putting them through five tests before they can leave his maze. After the "Collapse" test was chosen, the group was teleported to atop of a brittle stone floor floating above a massive chasm, requiring them to reach a safe platform. He and other shinobi attempted to attack Ōga, who turned out to be a projection. Concerned by the others still on the platform, Kiseru grabbed one of the rope barriers and lowered it as a makeshift ladder for them to climb. He was sad they couldn't save everyone, but assured Boruto that they did the best they could.

As the survivors grew restless and begin fighting amongst each other, Boruto insisted that team-work was their only chance to survive. Rokuro however pointed out that it would only work if everyone was really on the same side, having realised that the Kusa-nin was actually a spy for Ōga. As the man denied it, Kiseru remembered how the man already seemed aware of the rules of the last test before the it began. Rokuro then unleashed his technique on the man. Fearing for his life, the man begged Ōga for help, proving Rokuro's suspicions to be true. Ōga appeared indifferently watched as the man was killed. He then presented the survivors with the remaining tests. Rokuro chose the Light test. As everyone was sent to a dark room, Ōga presented them with each with a candle. He explained that everyone's candle at the start of the test was linked to their life and that if the candle went out, they would die. Their journey led them through a watery pipeline and then a desert-like incinerator. Finally, the survivors to enter two slow-moving elevators. As it was realised that the candles would not last long enough for them to clear the test in the elevator, Kiseru reluctantly admitted that their only chance to survive was to sacrifice someone to take their candle as an extension to their own candle. However, Boruto remembered the exact wording of Ōga's rules and realised that they could all survive by unite their candles into one, extending the group's time and passing the test.

Trivia

 * Written as 煙管, "kiseru" is a type of Japanese smoking pipe, while his surname indicates the shank of the kiseru.