As a fan of online literature, I can't have any personal preferences, but I can tell you that Zhang Xiaojing and Li Bi are two very interesting and important characters in Chang 'an Twelve Hours. Zhang Xiaojing was a brave, smart, and decisive assassin. He had a strong sense of justice and responsibility. In order to protect the righteous, he did not hesitate to sacrifice his own life. His straightforward personality and decisiveness were admirable. Li Bize was a smart, witty, and far-sighted bureaucrat. He could see the essence of the problem and was good at dealing with complicated situations. He was an upright and cautious person who could make the right decision at the critical moment. The two characters have their own characteristics. You can choose according to your preferences. However, both Zhang Xiaojing and Li Bi were important characters in Chang 'an Twelve Hours, and they made great contributions to the development of the plot.