Mukuro Ikusaba felt like her title was her's. She's a solder. A warrior, she gains more honor than her sister.
But it wasn't enough. She wanted for her younger sister to talk to her, to look up to her. She practically listens to her every command to make their relationship better. So she'll listen to her when she says, "Put on this wig." She'll listen when she says, "You are now me." Because it's the only way they can communicate.
With a new title, a new name and a new life, Mukuro Ikusaba fitted into her role as Super High School Level Fashionista. She was confident, she would never die in this situation.
After all those years of Junko Enoshima's fame and her big sister that wasn't as famous as her, she was finally noticed. Her little sister was still different than her though. Her little sister was obsessed with despair and Mukuro Ikusaba would not submit to despair after Naegi's support.
The only thing that would make her fall into despair is her little sister's betrayal. She never thought her sister would kill her. She never thought she would tremble while looking at her blood soaked hands while her voice broke as she tried to find reason.
Her life was sacrificed for her sister's greed. But it's still not enough.