Recent full picture of Eternal. He was created by another character I have. He is akin to his child though his body is not natural and functions like a normal adult male he's not totally mentally grown up. He's very naive and trusting.

The center of his chest has the face of a clock embedded. It is connected to his heart. When the clock breaks/stops ticking Eternal is likely to die.

Under his eyes are the roman numerals for 6 and 12.
He uses two sabers for weapons and chains.
His teeth are sharpened and shark-like.