Do they ever explain why only the Jap ships have animal ears and human ears?
It seems like every nation has a "thing", like British capital ships having the maid or royalty motif, the German ships having the chompy iron monster equipment, and the Japanese having demon or beastial features. (Which itself is presumably something of a dig at Japan for being demons or beasts during WW2.)
The American "thing" is having ships that have pieces of traits from everywhere else, presumably as a nod towards being a nation of immigrants.