Unlockable warriors:

Zhauge Iang        Finish Musou mode as Zhao Yun.
Zhang Jiao         Finish the Yellow Turban stage 100%
Yue Ying           Finish Musou mode as Zhauge Liang.
Pong Tong          Finish the last stage in the fourth column 
                   in Musou mode as Shu.
Meng Hou           Finish Nan Zhong stage 100% in Conquest mode.
Lu Bu              Finish the Battle Of Xia Pi (Dong Zhoug's side) 100% 
                   in Free mode.
Liu Bei            Finish the last stage in the fourth column 
                   in Musou mode as Shu.
Jiang Wei          Finish Musou mode as Zhauge Liang.
Houng Zhong        Finish Musou mode as Zhao Yun.
Guan Ping          Finish Musou mode as Zhao Yun.
Dong Zhoug         Finish Si Shui Gate 100% in Musou mode.
Diao Chen          Finish Si Shui Gate (Dong Zhoug's side) 100% 
                   in Free mode.

Unlock Hex Mark horse:
     Beat Liu Bei in Si Shui Gate as Dong Zhoug.

Unlock Storm horse:
     Beat Cao Cao in the battle of Xia Pi as the Dong Zhoug force.

Unlock Shadow horse:
     Beat Cao Cao in the Battle Of Wan Castle.

Unlock Red Hare horse:
     Beat Guan Yu using Yellow Turban force in Escape Chang Ban Battle.