Xian Mei

Xian Mei, the Assassin, is one of the four playable Heroes in Dead Island and Dead Island: Riptide. Before the outbreak she was an employee at the Royal Palms Resort. She was sent to Banoi Island by her superiors to spy on the wealthy Westerners that stay there. As soon as she arrived at the hotel, the manager put her on 24 hour surveillance. Because of this, she's most likely the protagonist of the Dead Island franchise.
In the DZ2K series, she is the main protagonist in DZ2K12.
In Mirage Warriors, she is a main character in both games.