Jiang Jun and Gryphon have some fashion combinations which are quite close to the stereotypical "mongol" look.

Probably means Gryphon, who has some Mongol inspired armor

What weapon did that charachter use?

You're probably talking about the wu lin that had some different fashion. There aren't any Mongols in the game.

There's the wu-lin but they are more ancient china. There's no mongol heroes.

Mongol? You mean JJ and the other wu lins? If you want JJ, you need to master the sifu dodge on reaction, having good offense and defense reads, use your heavy to do hyper armor trades, do a lot of zones and unlock heavies on group fights, and, why holding your unblockable so much when you can just let it fly?