According to the Western Commission who did Lee Harvey Oswald assassinate?

Answer 1

You mean the Warren Commission as there is no information about a Western Commission.
The Warren Commission found that he acted alone.

Various parts of the report say:
His Marine career was not helped by his attitude that he was a man of great ability and intelligence and that many of his superiors in the Marine Corps were not sufficiently competent to give him orders. While Oswald did not seem to object to authority in the abstract, he did think that he should be the one to exercise it.
He was undesirably discharged from the Marine Corps Reserve, to which he had been assigned on inactive status following his transfer from active duty, after it was learned that he had defected to the Soviet Union.
The Commission has concluded that on April 10, 1963, Oswald shot at Maj. Gen. Edwin A. Walker (Resigned, U.S. Army), demonstrating once again his propensity to act dramatically and, in this instance violently, in furtherance of his beliefs.
The Commission has found no evidence that the extreme views expressed toward President Kennedy by some rightwing groups centered in Dallas or any other general atmosphere of hate or rightwing extremism which may have existed in the city of Dallas had any connection with Oswald's actions on November 22, 1963.