Currently, the spine-godot runtime only supports 2D scenes and nodes. The provided nodes such as SpineSprite, SpineBoneNode, and SpineSlotNode are designed to work within Godot's 2D environment. There is no built-in support for 3D scenes or 3D world space in the spine-godot runtime.
For a game style like Paper Mario, you would need to work within the 2D capabilities of the spine-godot runtime or consider alternative approaches to integrate Spine animations into a 3D environment.
