Well, I was originally thinking of what's his nuts from Suikoden 1, who manages to get references in three other games in the series. But that last clue tells me it's the Last Emperor of the Han, Dong Zhuo.
I mean, 1) Guy was Emperor
2) From what I recall, you're a ok to kill him, though you do have to say you mean it multiple times.
3) Destiny of an Emperor -> Romance of the Three Kingdoms -> Dynasty Warriors.