William J. Blazkowicz

Throughout the series, B.J. has always been portrayed as a fierce anti-fascist, American Dream-loving capitalist patriot, truth, justice, and the American way. He hates the Nazis in particular and what they do to others. He joined up to do his duty just as soon as he was old enough. In The New Colossus, it is shown that B.J.'s intense hatred of the Nazis stems from living under his abusive, racist father. Regardless of the circumstances, he lives to rid the world of them once and for all, as they're a constant threat to himself and his allies. He's a very loyal soldier, who doesn't rest until his job is done. During a conversation with Set Roth, he seems to be unable to understand complex scientific concepts, as he asks Set to spare him his explanation about head transplant.

In addition, B.J. showed anyone (except Nazis) compassion, not looking at their nationality, ethnicity or entitlement. This is evident with Billie, J and Bombate. He also shows this to Sigrun Engel, who had a similar childhood. Despite her being a former Nazi, he shows her kindness and defends her from his allies, notably Grace Walker.

Blazkowicz shows himself to have a sense of humor despite his serious demeanor, most notably shown in The Old Blood. An example is ignoring Kessler's warning to not fight any Nazis in Wulfburg, stating that their connection via radio was breaking. His seriousness can come off humorous as well, cursing the moon for allowing Nazis to land and create a facility there in The New Order.

B.J. is feared by the Nazi regime, who refer to him as "Terror Billy", a terrorist and murderer who have wronged them for their beliefs. He is a one-man army, making many soldiers frightened of him, as they see him as a myth (as soldiers are heard speaking of him in areas of gameplay). In The New Order, soldiers would scream that he's coming in German, as in The New Colossus, a soldier recalls cleaning the mess of B.J.'s battle that left him with nightmares.