The sweet, innocent mirror twin of Len Kagamine.
Rin is an innocent young thing. She is sweet and childish, even if she is supposed to be 14. She is always kind, but slightly shy. Rin is very connected to Len, her mirror image/brother. She couldn't live without him and can't think of losing him. He is very protective of her and she likes how people don't really try to mess with her anymore because of him. Sometimes he has been known to, teasingly, call her "bunny ears" because of her ribbon. She doesn't mind him teasing her because she knows he never means it. Rin has a tendency to cry over things when they don't go right or something happens, and Len is typically one of the only ones who can stop her.
Usually all she carries is a small coin purse so she can buy whatever she needs when she is in town. Sometimes she is known to carry an iPod or something and she does listen to it a lot with her favorite pair of headphones.
You'll see in the introduction/story or you'll learn more throughout the course of the story.