Kagamine Rin is a virtual singer developed by Crypton Future Media. She is one half of the Kagamine twins, along with her brother Len. Rin is known for her cute and energetic voice, and she is often used in songs that are upbeat and cheerful. She has also been used in songs that are more serious and emotional, and she has a wide range of vocal expressions. Rin is a popular choice for vocaloid producers, and she has been used in a wide variety of songs, from pop and rock to electronic and dance.