This mecha paper model is Diana A, the second giant robot Sayaka Yumi piloted in the anime after Aphrodite A was destroyed in battle, based on the Mazinger Z (Tranzor Z) manga and anime series, the papercraft is created by AnimeMania.
While Diana A is stronger than Aphrodite, it was still designed as a sign of peace; and had little offensive weaponry. Diana A does not appear in the original manga with the manga version of Venus A used in its place.
Diana A is given a frame more similar to Mazinger Z and Minerva X, featuring a more humanoid face colored dark pink with a light purple crown. Its torso is colored different shades of blue while its joints are colored yellow. On its chests are a pair of light pink tipped missiles. [Source: wikia]
You can download this robot paper model here: Mazinger Z - Diana A Free Robot Paper Model Download