Slashgrats
85: A Worthy Opponent
Defeat one of the powerful champions of the Pandarian races that wander the continent.
Hozen
Mantid
Mogu Warrior
Saurok
Jinyu
Mogu Sorcerer
Pandaren
Yaungol
There are many different NPCs you can go for. The list is quiet big really, check it out here.
NPC Scan is a great addon that will help out with.