Fugō

is a man who was kidnapped by Ōga for his experiments.

Personality
Fugō is a very nervous man, always clutching his briefcase. So desperate to live, he has no problem letting other people die for his own survival. He is materialistic, trying to exchange his luxury watch for an old woman's water while in captivity, angry when she wouldn't agree to it.

Labyrinth Game Arc
Fugō is among a group of Thunder Train passengers taken to Ōga's labyrinth in order for him to run his survival experiments. During the first experiment, Batta voices her opinion that she finds it unlikely that he'll survive on his own, and gets him to hire her for protection, being one of 14 captives to survive the first, collapsing platforms experiment.

While waiting for the second experiment to begin, he failed to convince an old woman to give him her water in exchange for his luxury watch. When the experiment began, Ōga explained how their lives were tied to their candles, and rules about holding them. Fugō went ahead with Batta and Rokuro. While going through a water-filled section, Fugō refused to let Batta hold his briefcase, even if meant he could more securely hold the lantern with his candle. Near the end, they had to wait so all the spots on an elevator could be filled. Two civilians from the larger group did when they arrived. During the slow ascent, they realised that their candles wouldn't last, and when Rokuro claimed a girl's candle for himself, he ordered Batta to get the other civilians' for them. The three waited, and after the other group arrived, having suffered no deaths over creating a long, communal candle, Ōga declared the second experiment over.

When Ōga returned to begin the next experiment, the "Collapse" test was selected. The group was teleported to another room. Soon, they found the ceiling begin to slowly descend on them. A button was then pressed revealing a few chambers for people to squeeze into to escape being crushed. Fugō frantically knocked Shamo aside to get one of them. Boruto discovered that the floors weren't completely solid as the water seeped through. As Boruto and others began tried to break through the floor, Fugō urged Batta to knock Yatsume aside for one of the chambers. Batta voiced her disgust at Fugō's indifference at destroying other people's lives, revealing that her homeland was bought by rich developers, casting away Batta and her people. Ultimately, Batta was convinced to help, who was able to find the weak point in the floor, letting Boruto break through to save everyone. Once returning to the original room, Fugō inspected his briefcase, containing only a flask and a photo of his family.

Trivia

 * "Fugō" could be a shortening of either of the following:
 * "fugōkaku" (不合格), which means "(examination) failure", "rejection", "disqualification"
 * "fugōri" (不合理), which means "unreasonable", "irrational", "absurd", "inconsistent"