She was manufactured 30 years ago, and then an immortal mage from the medieval era found her, and gave her life using magic. She is extremely light, given she's full of air, and mana.
@KeonWolf I use a combination of VRoid, and Unity Editor. First I export as a VRM, use UniVRM to put the model into Unity, and then I apply a matcap. For a matcap like this, I go into any image editor, make a 512x 512y size image. The image is all black, with two white faded circles. What this means when read as a matcap: Black (display nothing) White (display a white circle that follows the camera based on the vertex, or pixel data.) Try experimenting with it a little. Have some fun with it.
If this is set to "Allow", others can use this model according to the conditions of use set by its creator. Model data (VRM format) can be provided to other users, who can use it for various VR/AR platforms and other types of 3D content linked with VRoid Hub.