Although we don't know what Fei's ability is, we do know that most of the time, she's the smartest person in the room and willing to work things out. (Sounds a lot like our number three, Allison.) She's described as someone who "sees the world in a special way," which could be a hint at her power. While Fei may come across as a misanthrope, she secretly wishes she had a friend. But if you cross her, there's no looking back because Fei won't stop until the job is done.
Will Fei's ability to see the world differently help or hinder the Hargreeves in season three? It seems like she's their most likely bet for an ally on the Sparrows, but knowing them, they'll probably screw it up. Here's hoping she finds a friend, and not a foe, on the team!