Lan Fan

ランファン, Ran Fan, Ranfan
Lan Fan is one of two bodyguards of Ling Yao and the granddaughter of Lings other bodyguard Fu. She is very quiet and cares deeply for Ling. As a result she is constantly thinking of his safety and often forgets her own. Lan Fan is a very skilled fighter and is able to sense the presence of a soul referred to as chi thus she can quickly identify Homunculi like Envy that have more than one soul in their Philosophers Stones meaning she can easily see through Envys disguises. Although we are never told her age Ling refers to her as a girl so we can assume that she and Ling are around the same age. Source: Wikipedia