National Protection Alliance

Flag of the National Protection Alliance, from Kaiserreich.

Republic of China (Xinhai)

An Early flag for the Republic of China, circa 1911-1912. In Kaiserreich it is known as the Guominjun Clique.

Original Flag:
http://www.crwflags.com/fotw/images/c/cn%5E9ss.gif

Beiyang China

Flag of the Republic of China under the Beiyang government. (1912-1928)

Original Flag:
https://upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Flag_of_the_Republic_of_China_%281912-1928%29.svg/800px-Flag_of_the_Republic_of_China_%281912-1928%29.svg.png

Nationalist China/Republic of China (Taiwan)

Flag of Kuomintang/Nationalist Republic of China from 1927 onwards. It currently represents as the flag for Taiwan, the only representation of Nationalist China today.

Original Flag:
https://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Flag_of_the_Republic_of_China.svg/640px-Flag_of_the_Republic_of_China.svg.png