Suppression of emotions, following rules to the letter, indifference/coldness to each other, "Weltschmerz" visible on faces, protestant work ethic (=stick at work doing nothing to show bosses you are working) etc. Other parts of Germany feel slightly different though (Bavarians seem much happier), it might be just Frankfurt.

Japan is sort of the Germany of Asia. Both are very detail-oriented people, well known for craftsmanship, significant amount of global exports, their trains are always on time, etc.