Kōhei Katsuragi

Kōhei Katsuragi is a student and the class representative of class 1-A along with Arisu Sakayanagi.

Appearance
Kōhei is a well built young man of above average height. He has a bald head and large body frame compared to other students, which contributes to his intimidating appearance.

Personality
Kōhei is an intelligent student who worked very hard to reach Class 1-A and became one of its representatives.

He is a serious man who adheres to the rules of manners and good conduct as he reprimanded another student of Class A for making fun of Ken Sudō and his classmates. He was calm in telling Sudō not to get easily provoked by his classmates' actions, but his demeanor intimidated him into stopping from arguing any further. From this display, it shows he is one of the few upper students who have no problems in associating with those of the lower classes or that he was simply annoyed by their antics.

He expresses slight anger when some of his failures are mentioned, such as when he expressed annoyance after Kakeru Ryūen brought up him being rejected from joining the Student Council.

Plot
Kohei was first seen besides Arisu Sakayanagi listening to Manabu Horikita as he officially welcomes each student to the school.

Kohei was next seen with Arisu along with several other students being congratulated and was asked the extent of what they know about the S-system.

He makes another appearance again with Arisu looking at the scores of each class, remarking the advancement of C Class before following with a statement that Kakeru Ryūen is a dangerous man, to which Arisu simply responded by asking how boring it is.

During the cruise, Kohei was taking a lunch at a fancy restaurant within the ship. He reprimanded Yahiko Totsuka for inciting Ken Sudō, noting the possibility of bearing the consequence of losing points for bad behavior and to conduct himself a proper A-Class student should. Kohei continues on by asking if Sudō intends to repeat his earlier blunder, stopping the commotion from escalating.

After arriving on the Deserted Island, his class set up their camp inside a cave. He was spotted along with Yahiko conversing in front of the entrance by Kiyotaka Ayanokōji. Then sometime later, Kohei appears to confront Suzune Horikita and Ayanokoji, fending them off after knowing their motive to go inside their camp.

It was revealed that Kohei has made a contract with Ryūen, unaware that he was being deceived. Following that at the last day of the survival test, Kohei showed an expression of disbelief after knowing that A-Class ranked only in third place, clueless that it was because of Ayonokoji's elaborate scheme.

Trivia

 * According to Kakeru Ryūen, Kōhei was denied in trying to be apart of the Student Council, for reasons unknown.
 * According to Honami Ichinose, Kōhei is one of the people Class B should watch out for.
 * Kōhei's voice actor also voiced Momonga, the main protagonist of the Overlord series.