His eyes were not green. They were luminous, feral, burning with a primal rage that had no name. His mouth was locked open in a perpetual, silent roar. And from his shoulders and limbs, steam poured as his body began to rebuild itself—muscle knitting over bone, skin sealing over muscle.
Eren's transformation has a profound psychological impact on his character. He is forced to grapple with the trauma of his past, including the loss of his mother and his feelings of helplessness. His transformation into a Titan becomes a manifestation of his inner turmoil, as he struggles to reconcile his human and monstrous aspects. eren first transformation
It was not a Titan’s hand. It was human-sized, sinewy, and impossibly strong. The fingers dug into the Titan’s own flesh and pried the wound open like a pair of bloody curtains. Out of the steaming cavity, a figure rose: naked, slick with viscera, and screaming a sound that was not quite human. His eyes were not green