The character can detect what motivates people and take advantage of it, he is a great manipulator.
After a short conversation, he understands the deep desires of his interlocutors and knows how to take advantage of them.
He knows how to influence weak minds and make them indebted to him.
This is rarely enough to turn an enemy against his own side.
This Feat is not a drawback. Thus the character is not necessarily a compulsive manipulator or a perverse narcissistic manipulator psychopath. He is simply able to manipulate others if the situation requires it.