The 'governor', 'inspector', and 'visitor' in the poem depict powerful and influential people. The poem is titled "The Man He Killed" by Thomas Hardy, and it explores the absurdity and senselessness of war.

The governor, inspector, and visitor are mentioned in the context of the speaker's encounter with a man whom he eventually kills. These three figures symbolize the authority and hierarchy within society, particularly in the context of war and the military.

1. Governor: The governor represents the highest level of authority and power in the military or government. In the poem, the speaker reflects on how he and the man he kills could have been friends if they had met under different circumstances. However, the presence of the governor suggests that their lives are ultimately controlled and manipulated by those in power. The governor's influence extends beyond the battlefield and impacts the lives of individual soldiers.

2. Inspector: The inspector represents the middle level of authority and power. While not as high-ranking as the governor, the inspector still holds significant power within the military hierarchy. The mention of the inspector implies that there is a system of surveillance and control in place to ensure obedience and maintain order among the soldiers. The inspector's presence further emphasizes how individuals are subject to the whims and decisions of those in positions of authority.

3. Visitor: The visitor represents someone external to the military or government hierarchy but still holds influence and power. This could refer to a politician, diplomat, or any other influential figure who has the ability to shape the course of events. The visitor's presence suggests that the decisions made by those in power are often driven by external interests and agendas. The lives of soldiers, like the man killed in the poem, become pawns in a larger political game.

In conclusion, the 'governor', 'inspector', and 'visitor' in the poem symbolize the power dynamics and influences that impact the lives of individuals in a war or military context. They represent the higher officials, government officials, political people, and powerful and influential individuals who hold sway over the lives of those on the ground.