Kousuke Kunisaki

An undercover agent who comes to Duel Academia to find information on the missing students in the Abandoned Dorm. Kousuke Kunisaki disguises himself as a Osiris Red student and proceeds to wonder why students from other dorms will not speak to him and meets Juudai Yuuki, Shou Marufuji and Hayato Maeda.

(Source: Yu-Gi-Oh! Wiki)