This is a skin of Mata Nui (Great Spirit Robot) from LEGO's discontinued theme, Bionicle

Mata Nui, the Great Spirit, is the powerful being who acted as the guardian and host for the robotic structure of the Matoran Universe for the past 100,000 years. Betrayed by the Brotherhood of Makuta, his spirit was driven from his body by the actions ofMakuta Teridax, and cast out into the galaxy. Landing on Bara Magna, he was caught up in the war occurring there, and put aside his own concerns to assist newfound allies. Since then, he has retreated inside the Kanohi Ignika, after defeating Teridax and restoring Spherus Magna.