Nimrod was the baddest bad guy who ever lived. The Midrash says Nimrod was either very diminutive in stature, or extremely large, like the giant Philistine who David killed with a stone. We chose, for obvious reasons, to make him large and formidable in appearance. The Midrash also tells of a legend that Nimrod had the animal skin cloak of Adam. It had been handed down through generations and Nimrod swiped it. It gave Nimrod special ability as an archer. With the cloak on, he could hit anything that moved.
Above is the character design by Pascal Colpron. Below is the costume design by Grigor Kuzmanov.