Hatsune Miku is a virtual star known to many people around the world. In the world of sekai she helps people to realize their true feelings and creates a world just for them. Along with her are her other virtual singer friends. 

Her voice range is pretty large, however she is generally seen as higher pitched and happy. The only version of her where she js not like this is in her Nightcord 25:00 where she sounds more monotone. Please keep in mind when auditioning for this role that she will have a lot of lines for each of the six groups and her vocal range can change. You are free to make your own interpretation of the character.

Example: https://youtu.be/TPNtUvOEjY4