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.
Pretender
Since 1911, the Japanese government has declared the southern claimants were actually the rightful emperors despite the fact that all subsequent emperors including the then-Emperor Meiji were descended from the Northern Court, reasoning the Southern Court retained possession of the Three Sacred Treasures, thus converting the emperors of the former Northern court into mere pretenders. In other words, six former emperors of the Northern Court have been counted as pretenders instead since then. As a result of this compromise, the present Japanese Imperial Family is descended of the Northern Court Emperors.