Emperor of Japan
The current Emperor on the throne is typically referred to as "Tennō Heika" (, "His (Imperial) Majesty the Emperor"), "Kinjō Heika" (, "His Current Majesty") or simply "Tennō", when speaking Japanese. The current Emperor will be renamed "Daijō Tennō" (, Retired Emperor), often shortened to "Jōkō" (), upon his planned retirement on 30 April 2019, and renamed "Heisei Tennō" () after his death and will then be referred to exclusively by that name in Japanese. In Japanese culture, it is considered a major faux pas to refer to a living Emperor by his posthumous name, although the posthumous name is the same as the era, which is used in official documents.
Emperor
As of the early 21st century, Japan's succession law prohibits a female from ascending the throne. With the birth of a daughter as the first child of the current crown prince, Naruhito, Japan considered abandoning that rule. However, shortly after the announcement that Princess Kiko was pregnant with her third child, the proposal to alter the Imperial Household Law was suspended by Prime Minister Junichiro Koizumi. On 3 January 2007, after the birth of her son, Prince Hisahito, Prime Minister Shinzo Abe announced that he would drop the proposal.