Zhang Fei, sworn brother of Liu Bei and Guan Yu was a military general of Shu Han during the Three Kingdoms era of China. Zhang Fei was shown to have been a masterful general rather than simply a warrior.He participated in many battles, always of on the side of his sworn brother Liu Bei.In the battle of Chang Ban, he stood on Changban bridge all by himself and forced 10.000 of Cao Cao&#039;s troops to withdraw,, ensuring Liu Bei&#039;s escape. He treated his superiors with respect, but had little respect for his underlings. He was often warned by Liu Bei that his habit of over-punishing his own soldiers by lashing and killing would eventually bring himself disaster. Zhang Fei married Xiahou Yuan&#039;s daughter, who was captured by Zhang Fei&#039;s troops as she was out gathering firewood. They had a total of two daughters, and the older daughter became the empress of Shu Han after marrying Liu Shan, with Zhuge Liang as the matchmaker. After Zhang Fei&#039;s eldest daughter had died due to natural causes, Zhuge Liang once again played the role of matchmaker, and Liu Shan married Zhang Fei&#039;s younger daughter, who thus succeeded her older sister to become the empress of Shu Han. Zhang Fei was killed by his own men Zhang Da and Fan Jiang, while preparing his troops to attack the rival Eastern Wu to avenge the death of Guan Yu. Zhang Da and Fan Jiang went on to defect to Wu.

Souten Kouro's story is based loosely on the events taking place in Three Kingdoms period of China during the life of the last Chancellor of the Eastern Han Dynasty, Cao Cao (155 &ndash; March 15, 220), who also serves as the main character. 
The Three Kingdoms period has been a popular theme in Japanese manga for decades, but Souten Kouro differs greatly from most of the others on several points. One significant difference is its highly positive portrayal of its main character, Cao Cao, who is traditionally the antagonist in not only Japanese manga, but also most novel versions of the Three Kingdoms period, including the original 14th century version, Romance of the Three Kingdoms by Luo Guanzhong. Another significant difference from others is that the storyline primarily uses the original historical account of the era, Records of Three Kingdoms by Chen Shou, as a reference rather than the aforementioned Romance of the Three Kingdoms novel. By this, the traditional hero of Romance of the Three Kingdoms, Liu Bei, takes on relatively less importance within the story and is portrayed in a less positive light. Yet, several aspects of the story are in fact based on the novel version, including the employment of its original characters such as Diao Chan, as well as anachronistic weapons such as Guan Yu's Green Dragon Crescent Blade and Zhang Fei's Viper Blade. 
A consistent theme throughout the story is Cao Cao's perpetual desire to break China and its people away from its old systems and ways of thinking and initiate a focus on pragmatism over empty ideals. This often puts him at odds with the prevalent customs and notions of Confucianism and those that support them. 
(Source: Wikipedia)

Fei Zhang