The name of Junko Enoshima's imposter at the beginning of Danganronpa: Trigger Happy Havoc is?

In the beginning of Danganronpa: Trigger Happy Havoc, the imposter who takes on the name of Junko Enoshima is none other than Mukuro Ikusaba. She poses as Junko to deceive the other students of Hope's Peak Academy and participate in the killing game orchestrated by Monokuma. Mukuro, who is the Ultimate Soldier, disguises herself as Junko in order to carry out her sister's plan and maintain the facade of the ultimate fashionista. However, her true identity is eventually exposed, revealing her role as the 16th student and Junko's sister.