武林萌主武林霸主

Here, 武林 (wǔlín) refers to martial arts community, traditionally the community in Chinese culture that practices martial arts. 萌主 (méngzhǔ) is a cute/casual title referring to someone being young yet influential, while 霸主 (bàzhǔ) refers to a dominant person who wields significant power over others. Together, this username can be understood as playfully declaring oneself both adorable but powerful within the context of Chinese kung fu or martial arts culture.