Therefore, it can be seen that Liu Bei's first strategist was Xu Shu, who was quite good at array tactics and knew many array schemes. He is very filial, which is both his strength and his weakness. It was because of his filial piety that he was deceived to Cao Ying. Not only did his mother die, but he could no longer serve the Lord himself, so he got the saying "Being in the Han Dynasty". He recommended Zhuge Liang to Liu Bei when he left.
So, the answer is: Uncle Xu!