Hideo Sotomura is a Class 1-D student who sits in the third row, leftmost seat—right behind Yousuke Hirata.
He's an average-height teenage boy with green eyes, spiky black hair, and glasses. Ayanokouji has noted he's a bit on the heavier side. You'll usually spot him in the standard school uniform, though he notably wore a brown trench coat during Argos Team's operation to spy on the girls' changing room. Like everyone else, he switched to the red tracksuit for the island test.
Hideo tends to fade into the background of Class 1-D's usual drama, which actually works in his favor—he's willing to seize opportunities others might miss, like volunteering to help Argos Team with their questionable mission. He's an otaku who speaks using archaic Japanese and spends his time collecting and keeping up with bishoujo games, manga, and animation.
During the Mixed Training Camp special exam, the Zazen instructor called out his dialect as "ridiculous," which prompted him to tone it down and speak in a more socially acceptable way.
Content compiled by AnimeList.moe from publicly available sources.