If you want more mythological style units then:
Wolf Guard: Infantry troops, not too good in offense or defense but lots of hitpoints and near fanatical. Covered in wolf pelts these guys hold the line while the Khanate cavalry sweeps in the sides or envelop. The idea is: 'too stubborn to quit, too stupid to die'.
Khan(ate) Guard: Sworn to defend the Khan and his empire, these heavy cavalry are shock troops. Always the first on the field, this unit will shatter weaker formations and make throw confusion in the enemy ranks, making it easier for the other Khanate troops to choose thier targets. However these guys should be hard to handle, they might charge any enemy on sight.
Demon Hunters: In these uncertain times, the Khanate has had to resort to more drastitc measures to deal with the growing reports of undead armies and demons to the North. The result was fight magic with magic, only the greatest warriors in the clans could endure the rituals and trials necessary to become a demon hunter. These tattooed riders are the fastest shock troops in the world, if only the Khanate had more of them. (The idea is sort of a hero unit for the mongols)
Obviously these suggestions are not firmly rooted in history, however the first two aren't that far off, and the last is just to add some flavor since the mongols have an encroaching horde from the north.
Bookmarks