"The twin sister of Len, she met Miku in the orphanage. In the orphanage, Rin was well-liked and preferred practicing with her wire, having learned wire technology from someone. She loves candy and constantly sneaks some into her office. Though she's often scolded by GUMI for wasting money, she doesn't care. She believes the Detective Brigade has a noble goal and she has a strong bond with Len and Miku."

Although Kagamine Rin is a Soprano, she can hit Mezzo notes, and seems to be more of a higher mezzo, lower soprano. Her voice is powerful, and tends to belt alot. However, her voice is youthful, and has a childish hint to it, showing her age of only 14. 

Trap singers are welcome to audition for this role. 

A sample of her voice: https://www.youtube.com/watch?v=wZ1gEDquuyQ