In the writings of Romance of the Three Kingdoms and even in a good amount of historical texts, Guan Yu had a long, flowing beard with the strength of a whole army, able to carry his pole arm named Green Dragon in a single hand.
So Rein sitting here with a confident look, a long majestic beard, and his robes with little armor, made me smile with genuine happiness. Out of the 3 announced skins, Reins is the closest to the original.