(1). Woodrow Wilson. His basic ideal was to avoid global conflict. (2). Paul von Hindenburg. He was a Prussian general. Hindenburg led a German army to a complete success at the Battle of Tannenburg. (3). Tsar Nicholas II. He was the last remaining Russian emperor. Tsar Nicholas II was the one who approved Russia's entry in WWI. (4). Winston Churchill. The first lord of the Admiralty. He resigned in 1915 because of his unsuccessful role in the Gallipoli campaign. (5). Kaiser Wilhelm II. He was the last German emperor.
There are many more important people in WWI, But here is a few. I hope this helps.
