Sima Yi

The Wei strategist, Sima Yi was studying, when he heard that Wei was looking for a stratigist. Sima, who knew he could use his talents to rule the land one day readily accepted.

Story overview
In Dynasty Warriors 6, his storyline revolves around him using Cao Cao's ambition as a means of gaining control of the land by any means neccesary. In his final cutscene, he is shown slaying Cao Cao, and ascending the throne.

Dynasty Warriors 4
Defeat Ma Chao and Wei Yan
 * Ultimate Weapon: Dark Feather
 * Power: 50
 * How to get it: Battle of Wu Zhang Plains