Karl Koller

"Oh... nein. It's Karl Koller. I bet he's now calling Richard Loud III about the serious reports in and around Central America about the UCRD, regarding the demons or Yuri's Army... even for the Grand Alliance."

--Su Ji-Hoon, Calling Koller

Karl Koller is a German General der Flieger and the Chief of the General Staff of Nazi Germany's Luftwaffe during World War II.

In When the Cold Breeze Blows Away, he serves once again as the Chief of the General Staff of the Nazi Union's Luftwaffe during World War III.

Later on, he will be resigned from the Luftwaffe, and will succeded once again by Hans-Jürgen Stumpff to make way for his position as the Chief of the General Staff of the Unified Capitalist Revolutionary Dictatorship People's Air Force, and Richard Loud III's personal caller adviser via telephone during the Demonic War, and also, a very kind babysitter of  Kevin Gilday, Delores Loud and Alana Loud, and a very good friend of George Gilday.