Akihito .
The current emperor is His Imperial Majesty Akihito. His reign began in 1989 with the death of his father, the Emperor Showa, and he was enthroned in 1990. Fitting with Japanese tradition, after his death he will be refered to by his posthumous name or kaimyo, Heisei.
Emperor Hirohito.
akhito
The emperor is not chosen, the heir to the throne is the one to become the emperor.
Emperor.
Emperor Akihito is the head of state.
The Emperor was Hirohito and the prime minister was GEN Tojo.
there is no emperor of china right now. but when there were they lived in the forbidin palace
Japan has a monarch (Emperor) as head of state and an elected prime minister as head of government.
Okinawa
Japan had a "Monarch" government during WW2. Their monarch was headed by an Emperor; Emperor Hirohito.
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If you mean national anthem, it's "Kimi-Ga-Yo", which means "May Your Reign Last Forever" (Dedicated to the emperor)