Do the following tasks to unlock these characters:
Dong Zhoug: finish Si Shui Gate 100% in Mosou Mode
Diao Chen: finish Si Shui Gate (Dong Zhoug's side) 100% in free mode
Guan Ping: finish Zhao Yun Mosou Mode
Houng Zhong: finish Zhao Yun Mosou Mode
Jiang Wei: finish Zhauge Liang Mouso Mode
Liu Bei: finish the last stage in the fouth column in Shu Mouso Mode
Lu Bu: finish battle of Xia Pi (Dong Zhoug's side) 100% in free mode
Meng Hou: finish 100% of Nan Zhong stage on Conquest
Pong Tong: finish the last stage in the fouth column in Shu Mouso Mode
Yue Ying: finish Zhauge Liang Mouso Mode
Zhang Jiao: finish Yellow Turban stage 100%
Zhauge Iang: finish Zhao Yun Mosou Mode
To unlock Horses, do the following:
Hex Mark Horse: defeat Liu Bei in Si Shui Gate with Dong Zhoug.
Red Hare Horse: defeat Guan Yu using Yellow Turban force in Escape Chang Ban bettle.
Shadow Horse: defeat Cao Cao in the Battle of Wan Castle.
Storm Horse: use Dong Zhoug force and Defeat Cao Cao in the battle of Xia Pi.