
Mikuo's depiction varies he's often portrayed as Miku's sibling, either as a twin or an older brother. His visual characteristics followed soon after. Mikuo came to be as a result of extreme down pitching of Miku's songs, and possibly a desire to have Miku sound masculine. This is because portrayals of him vary from artist to artist, he's commonly portrayed as tall and muscular or of small stature with a build similar to Miku. His height, weight, and optimum voice settings are undefined as well. Mikuo has no defined personality, as he is an open source character. On his left upper arm is the red mark "01", which is Miku's series number. The most popular hairstyle for him is short with bangs, though a ponytail has often been seen. There has been no defined design as it changes from artist to artist, but it is common to see him wearing pants and a sleeved shirt.


Mikuo's design is often reminiscent to that of Hatsune Miku, a Vocaloid 2 developed and distributed by Crypton Future Media.
