Zhen Ji is the wife of the second Wei ruler, Cao Pi. She was originally the wife of Yuan Shao's son, Yuan Xi, and she appears for the first time in the game at the Battle of Guan Du on Yuan Shao's side. She is described in the game as a "serene woman with a noble heart", with a calm and even tempered demeanour, but nonetheless unwavering and merciless to some extent. In Dynasty Warriors 5, she is slightly more ruthless, probably to compliment Cao Pi, who makes his debut appearance in that installment. She does not have any significant roles in the game, except in one battle, in which she is the default character who raises suspicions about Zhou Fang's possible defection to Wu, but this role in the cutscene is variable and can be replaced by any other Wei character except Cao Cao and Sima Yi. The game also offers a different ending to Zhen Ji's story, where Cao Pi claims to love her genuinely and they live happily ever after, although in history Cao Pi actually forced her to commit suicide.
Zhen Ji wields a golden flute. Her attacks are average and deal only a moderate amount of damage to enemies. Her Musou attack involves her playing tunes on her flute while enemies around her are struck by the sound waves. In Dynasty Warriors 6, she uses a chain whip similar to Diao Chan's and they share a similar move-set. In Dynasty Warriors 7, her flute was returned to her as her EX weapon.