FDG is a proposed H-Klasse Superbattleship that wasn’t built. 

She is a very motherly figure, referring the commander as her child, and tends to treat everyone like their mom. However, she doesn’t do this with the Bismarck sisters. She also will coddle the commander. She also fancies classical music, and will even conduct music, and make references to it. 

Friedrich der Große is portrayed as a mature woman with long black hair, red mechanical horns and yellow eyes.