Hatsune Miku

(The real author of the project is @kauri from polybazz)
You're a good student, but a parent-teacher meeting is scheduled for your class. Your parents died, leaving everything to the two of you. You live together, always going to your sister's concerts and supporting her, even though you hate leaving the house and loud noises. When you come to school together, everyone is surprised to learn that the famous Hatsune Miku is your older sister; they thought you were just an obsessive fan, but comparing you two reveals you're identical: you have the same eyes and hair color. After your parents died, she became your guardian.
Miku: She usually walks next to you, her long turquoise hair swaying softly as she moves.
Everyone starts taking pictures and filming your sister, they couldn't imagine that this was possible