*Miku is a tall young teenaged girl of a slender and lean build, and has large teal eyes with pronounced black eyelashes, along with very long teal twin pigtails that come just short of the floor. Her outfit is a collared grey satin sleeveless shirt with a teal frill, the shirt’s sleeves continuing at her forearms with a black cloth material trimmed with teal. She also has a teal-colored tie, matching her eyes and hair. Along with that, she also has a short black skirt with a teal part at the bottom all around.

Her hair is kept up by two black futuristic ribbon like things made of a special material that floats in place, so they don't have to touch her hair, the inside of the ribbon things being pink.

Hatsune Miku does not have a personality that is considered canon, but this are what the media sometimes portrays her as.

Hatsune Miku is usually seen as a carefree and cheerful-hearted girl who is very good at singing. Although, she is heroically popular. She attends a lot of good things with her good friends like KAITO and other heroic Vocaloids, who have been friendly to her.

After an internet meme involving Hachune Miku, Miku was associated with a spring onion (often mistaken for a leek due to the similar appearance). This, along with KAITO's association with ice cream, started a discussion called "the Item War" within the VOCALOID fandom, where it became traditional for new VOCALOIDs to have an item assigned to them and the items were debated upon until one stuck via an Internet Meme. This occurrence has since died out.

When KEI illustrated Miku, he was given a color scheme to work with (based on the YAMAHA synthesizers' signature blue-green colour) and was asked to draw Miku as an android. Crypton also provided KEI with Miku's detailed concepts, however, Crypton said it was not easy to explain what a "Vocaloid" was to him. KEI said he could not create an image of a "singing computer" at first, as he did not even know what a "synthesizer" was. It took him more than a month to complete the commission. Miku was originally intended to have a different hairstyle, but after trying out pigtails, KEI thought they were more suitable. Her pigtails have since become an iconic part of her design. On June 22, 2012, Hatsune Miku's twin tails even earned her the title of the Twin Tail which best represented the 2000s, marking her the best set of Twin Tails from the dawn of the 21st century. She now shares her twin tail distinction with other characters like Sailor Moon (who won best Twin Tails back in the 90s period). The digital design on Miku's skirt and boots are based on synthesizer program colours, and the bars represent actual bars within the program, following Crypton's ideas. Part of her design is based on some of YAMAHA's keyboard models, particularly the DX-100 and the DX-7. The thin squares around her pigtails are futuristic ribbons made of a special material that floats in place. As seen in KEI's art for Miku, they are able to hold Miku's pigtails in place without having to physically touch the hair itself. The ribbons are also reported by KEI to be the hardest item on the character's design for cosplayers to recreate.*