In Kingdom Hearts II, the Nobody Guard's main shape is that of a thick, grey ring lined by eight spikes that alternate in size from large to small. The face of the shield is comprised by a grey cross with a dark grey center. This shield is vaguely reminiscent of Axel's Eternal Flames.
In Kingdom Hearts III, the shield is a two-layered shield. The front-facing layer is a dark grey cross-shaped design with the Nobody sigil, while the second layer is a more circular layer with four more prongs. The Nobody Guard+ is a shinier grey palette swap of this design.
Kingdom Hearts III