Zhou Yu appears as a youthful and handsome long-haired man dressed in stylish robes. He is the sworn brother of Sun Ce and they marry the older and younger of the Qiao sisters respectively. He joins Sun in defeating the Jiang Dong warlords and contributes greatly to the founding of the kingdom of Wu. He serves as an important strategist to Sun Quan after Sun Ce's death. His greatest accomplishment is at the famous Battle of Chi Bi, where he plans the fire attack on Cao Cao's navy and leads the allied forces to victory. He does not appear in any battles after that if he is a non-playable character.
Source from Wikipeida