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.

Before the next experiments, the group discussed their dreams, Fugō wishing to deliver a payment to save his company. When the experiment began, the room they were in had a ceiling that would come down on them with spikes. Using switches on the walls, a few alcoves appear on the walls, so Fugō overtook Shamo to claim one for safety. He urged Batta to kill Yatsume to take her place, making her reveal that her displaced background. Led by Boruto, others were able to discover a weak spot on the floor and create extra room, so none of them died. Back in the waiting room, Fugō checked on his briefcase, which only had a photo of his family and a canteen.

Trivia

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