Wei

History
The Kingdom of Wei was created by Cao Cao. He was given the title Duke of Wei in 213 AD. His power continued to grow until, in 216 AD, Cao Cao was crowned King of Wei. In 220 AD Cao Cao passed away and left his holding to his son Cao Pi, who, in turn, diposed of the young Han Emperor and created the Wei Dynasty. Over the years the Sima family slowly gained more and more control of the Wei Dynasty. Eventually, Sima Yan, the grandson of Sima Yi, took over and created the Jin Dynasty in 265 AD.

Friends

 * Han (Cao Cao was prime minister of the han and essentially ruled the Dynasty)
 * Wu (For a short time)
 * Liu Bei (For a short time, but even after they became enemies, the two still held much respect and admiration for each other)

Enemies

 * Dong Zhuo
 * Shu
 * Wu - early in the games.
 * Yuan Shao - late in his life.
 * Lu Bu
 * Yuan Shu

Generals of Wei
Ruler: Cao Cao
 * Cao Pi
 * Xiahou Dun
 * Xiahou Yuan
 * Xu Huang
 * Dian Wei
 * Xu Zhu
 * Zhang Liao - later.
 * Zhang He - later.
 * Zhen Ji - later.
 * Cao Ren
 * Sima Yi
 * Pang De - later.
 * Cao Hong
 * Cao Mao
 * Cao Rui
 * Cao Xiu
 * Cao Zhang
 * Cao Zhen
 * Cao Zhi
 * Cheng Wu
 * Cheng Yu
 * Chen Gong (until he rebelled)
 * Chen Qun
 * Chen Tai
 * Cui Liang
 * Deng Ai
 * Fei Yao
 * Gao Lan
 * Gongsun Yuan
 * Guo Huai
 * Guo Jia
 * Han De
 * Han Sui
 * Hao Zhao
 * Hou Cheng
 * Hou Xuan
 * Hua Xin
 * Jia Xu
 * Jiang Gan
 * Jiang Ji
 * Jiang Wei (until he rebelled)
 * Li Dian
 * Li Fu
 * Liang Kuan
 * Liang Xu (until he rebelled)
 * Liu Xun
 * Liu Ye
 * Lu Kuang
 * Lu Xiang
 * Man Chong
 * Meng Da
 * Mi Heng
 * Shen Dan
 * Shen Yi
 * Sima Yan
 * Sima Zhao
 * Song Xian
 * Wang Lang
 * Wang Ping (until he rebelled)
 * Wang Shuang
 * Wei Kang
 * Wei Xu
 * Wen Pin
 * Wen Qin
 * Wen Yang
 * Xiahou Ba
 * Xiahou He
 * Xiahou Mao
 * Xiahou Shang
 * Xiahou Wei
 * Xin Pi
 * Xu Shu (after betraying Liu Bei)
 * Xun You
 * Xun Yu
 * Yang Hu
 * Yang Qiu
 * Yang Xiu
 * Yin Feng
 * Yin Shang (until he rebelled)
 * Yue Jin
 * Yu Jin
 * Zhang Hu
 * Zhang Lu (after many of his comrades in arms died)
 * Zhang Yan (after many of his comrades in arms died)
 * Zhao Ang
 * Zhong Hui
 * Zhong Yao
 * Zhu Ling (after leaving Yuan Shao)
 * Zhuge Dan

Youtube Character video
http://www.youtube.com/watch?v=aNpLof4gBgQ