This mecha paper model is Great General of Darkness, the military commander of the Mycenae Empire, making him a major antagonist in the first half of Great Mazinger, from the Mazinger Z (Tranzor Z) manga and anime series, the papercraft is created by AnimeMania.
Great General of Darkness serves directly under the Emperor of Darkness and commands the Empire's seven armies. The Great General is a powerful and physically overwhelming giant who is a forced to be reckoned with. Whoever is not entirely loyal to him or the empire in his ranks is controlled by fear. Loyal to the Mycenae Empire, he will strike down any threat to it, whether it be the Mazinger robots or a rogue within the Empire's ranks.
The Great General is a gigantic warrior with a navy helmet that has a stoic face and three spikes portruding from it, a long red cape, and dark blue Roman-esque armor. His true face is located on his chest and is a bearded old man. [Source: wikia]
You can download this papercraft template here: Great Mazinger - Great General of Darkness Robot Paper Model Free Template Download