Erm, Sima Yan was the guy who unified china; Sima Hui was the guy who (in the novel) recommended Zhuge Liang and Pang Tong to Liu Bei.
Anyway, I suppose I should repost (and update) my list, sooo...
Shu: Liao Hua, Wang Ping, Zhang Yi (Boqi), Zhang Yi (Bogong), Zhang Yi (Junsi), Zong Yu, Deng Zhi, Zhuge Zhan.
Wu: Lu Kang, Quan Cong, Zhu Zhi, Zhuge Ke, Sun Deng.
Wei: Cao Rui, Hao Zhao, Chen Tai, Cao Zhen, Niu Jin, Guo Huai
Jin: Sima Yan, Du Yu, Yang Hu, Sima You, Wei Guan, Hu Lie, Hu Zun
New Yuan Shao Faction: Yuan Tan, Yuan Shang, Qu Yi, Yan Liang, Wen Chou, Tian Feng, Ju Shou, Shen Pei, Wang Xiu
New Yuan Shu Faction: Yuan Shu, Ji Ling, Zhang Xun, Yuan Yin, Yuan Yao (they'll have multiple Wu officers)
New Dong Zhuo/etc. Faction: Li Jue, Li Ru, Hua Xiong, Guo Si, Li Su, Hu Chu'er, Xu Rong (history, not novel!), Zhang Xiu
New Later Han faction: Emperor Xian, Huangfu Song, Zhu Jun, Wang Yun, Liu Yu (they'd attract pro-Han officers from multiple forces)
New Liu Biao faction: Liu Biao, Liu Qi, Liu Cong, Lady Cai, Huang Zu, Cai Mao, Kuai Liang, Kuai Yue, Zhang Xian, Han Xuan
Other rulers: He Jin, Gongsun Zan, Liu Yan, Gongsun Yuan, Zhang Yan
Other followers: Bo Cai, Zhang Ren, Gao Shun, Chen Deng
...somehow I don't think they'll all be added in one game.
Unless I specifically say otherwise, assume I am talking about historical Three Kingdoms, and not the novel.