These are the Antagonists in Shitsurakuen. They mainly consist of men, although Shishidou Hiyo is an exception for two chapters in the story.
“Mitarai (御手洗) is a member of the Student Council, which seemingly gets onto Houjou's nerves at...Mitarai
“Kajiwara Shinji (梶原 シンジ) is a member of the Student Council. He is Himoto Sora's first opponent...Kajiwara Shinji