As a Titan, Eren's appearance changes quite drastically. Along with a massive increase in height (to 15M), his hair grows long enough to Graze his shoulders, with his tongue and ears becoming elongated. His facial features also undergo a transformation. Along with a prominent, hooked nose, his eyes are deeply sunken within their sockets, and his mouth takes on an unusual, jagged shape that is unsuited for intelligible speech, though he is capable of howling and roaring, expressing his exhaustion and Anger. He also lacks lips and Flesh on his cheeks, exposing all his teeth. His Titan holds some resemblance to his Father's Titan form, due to a lean, muscular build, short, dark hair, elongated ears, and a skinless jaw.
