Hideo Sotomura is one of the students of Class 1-D who is seated in the leftmost seat in the third row behind Yousuke Hirata.

Hideo is a teenage boy of average height with green eyes and spiky black hair. He also wears glasses. He is a bit chubby according to Kiyotaka Ayanokouji, and is often seen wearing the school uniform, but wore a brown trench coat when supervising Argos Team's operation of spying on the girls' changing room.

Like every other first year, he wore the red tracksuit during the island test.

Hideo seems to blend in the background quite a bit, as he is neglected from the main events that seem to happen in Class 1-D. However, he does seem to capitalise on the opportunity, seeing the sense in helping out Argos team in their mission.

Hideo is an otaku in nature and is often heard using archaic Japanese to speak to his classmates. He collects and observes information every day, ranging from an interests of bishoujo game to manga and animation.

He was said to have a "ridiculous" dialect by the Zazen instructor in the Mixed Training Camp special exam, leading to him changing it to be acceptable by the society.

(Source: You-Zitsu Wiki)