This papercraft is the Evangelion Unit-01 (EVA-01), based on the Manga / Anime / Film series Neon Genesis Evangelion. For more information of the EVA-01 please read this post: Neon Genesis Evangelion – Evangelion Unit-01 (EVA-01) and Jet Alone Papercraft.
Evangelion Unit 01 was created in the Third Annex of Gehirn's Artificial Evolution Laboratory in Hakone and is piloted by Shinji Ikari. Unit 01's armor is primarily purple; some components are colored neon green, light blue, orange, and black. The humanoid entity beneath the armor has light brown skin, two emerald-green eyes, four small nostrils positioned, and red blood. It has the best battle record of all the Evangelions. It frequently acts independently, without the instructions of a pilot and without any apparent power source. The Eva will also take action to protect its pilot while sometimes servicing other interests. The Eva's resident soul, Yui Ikari, appears to be responsible for such events. Unit 01 is called the "Test Type".
Upon savagely disfiguring the fourteenth angel, Zeruel, Unit 01 used one of Zeruel's arms to regenerate its severed left arm and proceeded to devour the Angel and absorb its S² Engine. After acquiring it, the Eva is still sent into battle with an umbilical cable. The Mass Production models were later equipped with artifical S² Engines.
In The End of Evangelion film, as a result of Third Impact, Unit 01 was used by SEELE in order to perform the Human instrumentality project. At the conclusion, Unit 01 is left floating adrift in space, fossilized and still containing the soul of Yui Ikari. In the Rebuild of Evangelion series, Unit 01 sports more neon green highlights on the head, chest, abdomen, and arms.
The progressive knife and its storage mechanism are also redesigned, but most of the armor has not changed. During its fight with Shamshel, the skin of the humanoid entity beneath the armor is revealed to a lighter color than in the series. During its fight with Zeruel, after the internal batteries die, the neon green lights glow red and it sports a Halo as well as being able to fire an energy blast similar to the angels. It also replaced its missing arm with a limb formed out of its own AT field and absorbed Zeruel and its core, but the angel began to make it change into a new life form that defied reason, and would have come into existence at the cost of all previous life. It would have done so had Evangelion Mark.06 not thrown a spear from above and stopped Unit 01's transformation.
You can download this mecha paper model here: Neon Genesis Evangelion - EVA-01 Ver.2 Free Papercraft Download [Box] [Gavitex]