Identical Grandson: Germany looks like Germania with shorter hair. Averted with the Roman Empire, who looks like both his grandsons (or rather both take after him without looking identical); Romano got his hair color, while Italy got his eyes.
Germany looks so much like Germania that Funimation thought they were the same person. Lets hope that gets fixed.
Ancient Italy, i.e. the Roman Empire
What!? You don't even * &%&@ on the road!? You've at least kissed a girl, right? Maybe a little bit of !@#$ on the beach!?
Love at First Sight: According to his official profile, it happened to him at least twice: with Old Greece (Greece's mother) and Old Egypt (Egypt's mother).
Large Ham/ Incoming Ham: Each time that The Axis and Justice Destiny Strike Force would fight each other in season 1, the sounds of spotlights flicking on in the distance, a chorus of trumpets blaring triumphantly, and all countries looking nervously at the ocean, only to see a blinding light and an ENORMOUS Roman Empire traveling on a boat or a bed accompanied by a harem of beautiful women singing the following warning:
Roman Empire: In heaven, the police are British, the lovers are Italian, the chefs are French, the engineers are German, and the bankers are Swiss. In hell, the police are German, the lovers are Swiss, the chefs are British, the engineers are French, and the bankers are Italian.
Posthumous Character: Almost only seen in flashbacks (if we don't count the published manga and the filler island cameo in the anime), but even as late as the Chibitalia Renaissance strips, it's all about him. He also confirms that nations age and die with military weakness.