Are the Vocaloids Rin and Len Kagamine twins? Well, some Vocaloid fans say they are, and some say they aren't. Even though I consider them to be twins, that doesn't mean they are. This is because they have never been officially announced as twins. However, they do look alike (aside from their different genders). They also have the same number, the same last name, and they were released together. Despite this, people still say that they are not twins, and that they are actually just mirror images of each other. Although I personally think they are twins, I don't mind if other people think they aren't. So, I guess it just depends on what you yourself think they are. Besides, there are a lot of great songs that came from people thinking of them as not being brother and sister!