Yeger Sun wasn't a man of great stature. Maybe because of the pain he had spent most of the first leg of his life in, his growth was considerably stunted. It was hard to grow properly if your days were spent fighting back against what should ahve been your inevitable death.
Standing at just 5'7" or so—relatively below average for even a mortal human man, let alone a Fiend—he was slight of frame and small in presence. In fact… he looked no different from a lanky human boy.
Fiends would usually be very obviously Fiendish. They would have their elements weaved into their bodies, arms of fire and hair of flames. But Yeger didn't look like a Fiend at all.
It was uncanny how much he looked like the quiet kid at the back of the class, his somewhat pale complexion making people feel both pity and closeness to him.
However, while that was what most would see, Ryu saw something completely different.