At first Cyan appears to be quite indistinguishable from those around him.  He has short dark hair and inquisitive eyes.  Dresses in simple slacks, a dress shirt, a tie, and a trenchcoat.  The longer one watches him the more one starts to notice that something is off.  He stands too tall and straight.  While agile there is a certain stiffness to his movements.  He never slouches, hunches over, or unconsciously shrugs.  Now and then, he almost seems surprised by his own body movements.  When raising his brows in surprise or curiosity he often touches them immediately after with his finger tips as if surprised at their sudden relocation.

When speaking it is obvious he not from around here.  He quickly picks up languages and accents, but his vocabulary is far from common place.

Original appearance:  https://www.pinterest.com/pin/133911788895360604/