Not much is known about Willie as he does not appear in person in the game. A family photo suggests that Willie was a member of the Norwegian Armed Forces. In 1940, Willie went missing during the Axis invasion of Norway - it is presumed that he was either captured or killed. As a result, Solveig joined the Norwegian Resistance. This strained her relationship with her mother Astrid who did not want to lose her daughter after losing Willie.
- In game, Willie Bjørnstad's name is never mentioned, with only a photo of him being depicted. His name is instead shown on the description of the official TOTAKU Solveig statue.
- His Krag-Jørgensen shown in the photograph may be the same weapon Solvieg starts Nordlys with.