Cumans and Huns for sure although for cumans you could argue they settled in Hungary at a certain point and may have used heavy cavalry. Huns however? They mostly represent the ones who settled in Europe in late antiquity and training paladins while having no steppe lancers is so silly.
The game still has an highly European tech tree but eventually paladins will become a regional unit once there will be regional skins and Europe will be just a region among others.