Originally Posted by
Lord Oda Nobunaga
Technically the Three Kingdoms did not exist until 215 when Liu Bei and Cao Cao finished off the last two warlords (Liu Zhang in Yi and Zhang Lu in Hanzhong). The term is usually used to refer to the collapse of the Han Dynasty that started with the Yellow Turban revolt in 184 or the usurpation by Dong Zhuo in 189. In 189-191 there were multiple warlords that controlled various cities. Gradually these warlords were either picked off or joined with other warlords. In 193 almost everyone was established and there existed perhaps 20 warlords. In addition to this there were multiple tribes on the steppe that became involved, the Xiongnu were a tribal entity that had existed within the empire for a century and they resided in Bing province. Likewise in the south there were multiple tribes that took minor roles, usually pledging allegiance to whoever was in charge but rising up in revolt as well. The Han Dynasty itself was not technically abolished until 220 when Cao Pi forced Emperor Xian to abdicate.
If it was in say 193 then the factions should be Cao Cao, Liu Bei, Sun Jian, Gongsun Zan, Gonsun Yuan, Yuan Shao, Yuan Shu, Ma Teng, Li Jue, Liu Biao, Zhang Yang, Lu Bu, Liu Yao, Xu Gong, Wang Lang, Tao Qian, Zhang Xiu, Shi Xie, Liu Zhang, Zhang Lu, the Xiongnu (in Bing province), the Yellow Turbans, various southern tribes, the Heishan Bandits.