Since this is a unique situation and likely what they are most accustomed to, The Creators would allow the inhabitant to keep both their physical forms and upload them accordingly.

Though since Vrtra's true form is a bit too large for the usual way of entrance, it will be instead in the main hub proper that has much space and capability to move around more freely. Don't worry, we won't force him to squeeze through a tiny door not meant for dragons of his size... even as amusing as the thought might be.