He Jin

He Jin was the Regent of the Han Dynasty. He had gained power due to his sister being Empress. While in charge, he gathered forces to fight the Yellow Turbans led by Zhang Jiao, and plotted to eliminate the corrupt Eunuchs with the help of Yuan Shao. He summoned Dong Zhuo and Ding Yuan to the capital to aid in the plan, but he was discovered and executed before they could arrive. In retaliation, Yuan Shao and Dong Zhuo stormed the capital, and successfully slew or routed the Eunuchs, but Dong Zhuo's seized power by deposing the young Emperor, setting off events that would lead to the Allied Forces.

Dynasty Warriors
In the games, He Jin is presented as a loyal commander who is trying to use his immense power to better the empire, but curiously enough in the manual for Dynasty Warriors 2, he is called a dictator comparable to Dong Zhuo, and in Dynasty Warriors Advance, he is portrayed as a stereotypical cowardly aristocrat.