Rhone appears as a man in plate armour, only his jaw being visible most of the time beneath his helmet. His armour is adorned with a golden cross on the breast plate and a wing-like motif either side of the head. He wears a red cloak with this, his pin signifying his association with the True Cross Order attached to it.
Rhone appeared to be quite taciturn, whether he didn't, or was unable to speak when he appeared is unclear, but he communitcated with Rin and Yukio Okumura through nodding and other simple gestures.
Five hundred years in the past, Rhone was the Paladin of the True Cross Order. At some point in his career he reportedly created the Labyrinth Garden.