しゅじんこう主人公shujinkou
1.

The primary character around whom a narrative revolves, often facing challenges and driving the plot forward.

2.

The central figure in a literary or dramatic work, typically representing the theme and embodying the story's main conflict.

3.

A key individual in events or narratives who exhibits qualities of leadership, courage, or moral integrity, often inspiring others.

Example:

主人公は、本の最後で死んだ。