Shadow is a no nonsense lone warrior who has taken it upon himself to wander the land and try to keep "order" as he sees it. Whether someone is good or evil doesn't matter to him, if he thinks manipulating or killing them will help the "greater good" then he will not hesitate and feels no remorse. He can be quite a cold warrior.
Physically he's not super muscular, but well built. Flight is his primary means for getting around and his body is built relatively light to accommodate. He carries a sword on his back which is not shown in the reference art.