Hatsune Miku is pictured as a 16 year old girl with blue anime eyes and long blue hair split into two long (reaching her knees long!) ponytails. She always has headphones on, and her usual outfit resembles a school uniform. Roughly translated, her name means 'first sound of the future'
Her more popular songs include 'love is war', 'world is mine' and 'po pi po'. She is also pictured with leeks alot as they were included in her 'po pi po' video, and have been associated with her since. She has previously performed live as a hologram with a live band.
person 2:"Hatsune Miku. It's vocaloid"
person 1: *listens* "wait, that's in Japanese.... this is kinda good"
American guy: Nope. Why?
Asian guy: ARE YOU FUCKING KIDDING ME? SHE'S AWESOME!
In Japan the animated character has held live concerts...
try figuring that out!