I don't know foreign regulations, but actually in Italy paramotors (not only complex wheeled ones such as Ikeharel's one, but also the smaller "backpack engine" ones, as long as they have an engine) must be registered as ultralights. Non-engined paragliders do not need to be registered.

I remember seeing one performing an aerobatic display (yes, they can perform some crazy maneuvers when flown by an expert pilot!), and it carried a visible "I-nnnn" registration on the sail.

Not that I'd upload a photo of one on this site anyway ...