Oxameter is a Corwid of the Free known for walking in a straight line and never stopping.
Oxameter is seen wearing a spherical helmet with features resembling a nose and two eyes on it. He is dressed in a robe, and instead of shoes, stands on oddly shaped plates with spikes on them. A belt can also be seen under his robe.
Zeno Clash 2 Edit
Oxameter's helmet can be found around where you last see him in the first Zeno Clash. It's in the desert, near the endworld entrance. You can flip his helmet over and take what is presumed to be his skull for an achievement.