ACCEL WORLD, Volume 1,Chapter 1(9)

The majority of other figures passing through the forest or laughing in groups of twos and threes were, like Haruyuki, also not human. Roughly half were silly animals walking on two legs, while the rest were fairies with wings sprouting from their backs (although they couldn’t actually fly), tin robots, or robed mages. All were avatars of Umesato Junior High students and teachers diving in the local net.
Students could choose from a wide selection of base avatar forms and customize them. If you had the patience, you could also construct a completely original avatar from scratch, taking advantage of the editor provided. The result was ultimately a combination of the technology available and taste of a junior high school student, but even so, the black knight avatar Haruyuki created and unveiled in April had garnered a lot of attention.
…The sad majesty of that avatar. Sighing, Haruyuki glanced down at his current form. In the blink of an eye, Araya had ripped off his black knight avatar and forced him to use this default pig.