Secret Characters found throughout the game.

Unlockable - How to Unlock:

Bai Qi - New Officer with name "Bai" "Qi"
Chen Qingzhi - New Officer with name "Chen" "Qingzhi"
Chengji Sihan - New Officer with name "Chengji" "Sihan"
Da Qiao - Load Dynasty Warriors 4 Data
Emperor Xian - Unlock all sages and pick He Jin in 281 "Hero" scenario
Fan Zeng - New Officer with name "Fan" "Zeng"
Guan Yiwu - New Officer with name "Guan" "Yiwu"
Han Xin - New Officer with name "Han" "Xin"
Huo Qubing - New Officer with name "Huo" "Qubing"
Japan Tribe - Search near Bei Hai when warlord tells you to. You must have Bei Hai to do this
Li Ji - New Officer with name "Li" "Ji"
Li Si - New Officer with name "Li" "Si"
Lin Xiangru - New Officer with name "Lin" "Xiangru"
Liu Bang - New Officer with name "Liu" "Bang"
Lu Ling Qi - Load Dynasty Tactics 2 Data
Ma Yunlu - Beat Tutorial Mode
Mistress Zhen - Get Good Ending with Yuan Shang on Inheritance Wars Challenge Scenario
Nanman Tribe - Beat Nanman Barbarians in scenario then beat game
Qiang Tribe - Beat Qiang Barbarians in scenario then beat game
Qin Liangyu - New Officer with name "Qin" "Liangyu"
Shan Yue Tribe - Beat Shen Yue Barbarians in scenario then beat game
Sun Bin - New Officer with name "Sun" "Bin"
Wang Jian - New Officer with name "Wang" "Jian"
Wu Wan Tribe - Beat Wu Wan Barbarians in scenario then beat game
Xiang Ji - New Officer with name "Xiang" "Ji"
Xiao He - New Officer with name "Xiao" "He"
Xiao Qiao - Load Dynasty Warriors 4 Extreme Legends Data
Yang Daiyan - New Officer with name "Yang" "Daiyan"
Ying Bu - New Officer with name "Ying" "Bu"
Ying Zheng - New Officer with name "Ying" "Zheng"
Yue Fei - New Officer with name "Yue" "Fei"
Yue Yi - New Officer with name "Yue" "Yi"
Yue Ying - Beat Tutorial Mode
Zhang Liang - New Officer with name "Zhang" "Liang"
Zhang Yi - New Officer with name "Zhang" "Yi"
Zhen Ji - Beat Inheritance Wars Scenario