Looking at possible sources, there's a possibility that the model is created using software like Blender or 3D modeling tools. It might be part of a subscription service, or sold on marketplaces. The numbers could correspond to specific features or body types.
: If you're trying to create your own custom character, familiarize yourself with the software or game's character creation tools. Software like Blender for 3D modeling or specific game engines like Unity or Unreal Engine have extensive resources for character creation. Vladmodels Y107 Karina Custom 3198