Kazukiyo Soga is the Class President of Class 1-A and ranks second in his class, after Haruhi.
Kazukiyo suffers from nyctophobia and a number of other phobias. He has romantic feelings for his Class co-representative, Momoka , whom he has known for years. He believes that she has feelings for Haruhi and since he believes himself to be unable to compete, is content with their friendly relationship, stating that it's an honor just to be Class 1-A co-representatives. Hikaru and Kaoru believe that he's the kind of person with pure feelings who they can't tease, possibly because he is even more emotionally vulnerable than Tamaki. In Volume 6 of the manga it's revealed that Kazukiyo's father is a famous politician. He goes on to study law at Ouran University, alongside Momoka and Haruhi.
RelationshipsEp 21 - Until the Day it Becomes a Pumpkin, it's revealed that Kazukiyo has a crush on Momoka and wants to prove he's not scared so he can impress her in the Halloween event. Though his fears get the best of him, he lasts longer than Momoka, who's paired with Renge. Following the event, Momoka tells him that she's impressed by his chivalry and that she couldn't last as long as he did, causing him to blush. Even though Kazukiyo knows Momoka has a crush on Haruhi, whom they both believe to be a boy, he says that he's content to be her friend and get closer to her by class representatives together. In Ep 26 - This is Our Ouran Fair! they are seen dancing together at the school festival. In the manga, it's revealed that Kazukiyo eventually admits his feelings to Momoka at university. Kasanoda in her plan to help Megumi admit her feelings about her parents' divorce. In the epilogue of the manga, Haruhi is shown providing moral support when he confesses to Momoka, and later, studying at Ouran University with the two, who are also law students. Although the two now know that Haruhi is a girl, they still call her "Haruhi-kun" out of habit.
After Hikaru is unable to get any sleep in his close proximity to Haruhi, he takes out his frustrations on Kazukiyo the next morning by forcing him to ski down the scariest slope. They get stranded in a blizzard, though, and Kazukiyo twists his ankle. Hikaru is overcome with guilt and piggybacks him to safety before fainting from exhaustion. Kazukiyo is shown later at the Hitachiins' New Year's party, assuring a group of girls that his leg is healing fine. When Haruhi announces in Chapter 83 that she's leaving to study abroad for a year, Kazukiyo panics that the twins' pranks on him will increase without her mitigating influence. When Kazukiyo admits his feelings to Momoka in college, Haruhi and the twins are shown in the backgroud cheering him on.