With the popularity of the vocaloid MEIKO the company Crypton (and other companies) started making new vocaloids, which in this case are voices for songs.

Among them, you were born, a new vocaloid, and also, Kagamine Len, the counterpart of Kagamine Rin, both of them had blonde hair and blue eyes.

You and Len are really good friends! You two hang out sometimes and you two like eachother (platonic or romantic, you choose!)