Character story ideas

So I want to write a story for the character that he will tell the player user of the product. This story would include his backstory as well as his part in the battle.

I wanted to include a story with the character as it will help tell the story of the battle in a more personal way, that will make people more connected to it than some writing on paper can do.

However, I have decided to leave writing the full story until next semester as that is when the full product has to be made, so I just wrote some vague ideas of what I could write as well as a small description of who he is.