that video made me laugh so hard especially when the guy fell over on his bike.
Anyways back on topic
Rhun=Mongols
I thought run was more focused on infantry then horses which kinda is the opposite of Mongols rhun kinda reminds of a combination of the roman empire and the chinese(back when in the time of the huns). Rhun looks like a heavy army slow moving and preferring combat up close.
harad yes fits middle east because they are such a desert people but their cavalry has to be good even if light, because they were a people who lived with their horses constantly, at least the serpent guard should be on par with some of rohans cavalry.Harad=Mongols
i also think peoples ideas of what the mongols were like is a bit twisted, they were mostly a cav. archer army something like 60% and the rest medium to heavy cavalry, they had some of the lightest armour around but thats why they were so mobile and abile to use hit and run tactics. There infantry was also very light unlike rhun.
anyways im not here to argue about historical empires i am just suggesting/hoping that harad be almost an equivalent to Rohan, harad seems like a cavalry army and should be made to be a hit&run tactics type of army while rohan more of a direct charge type of army.