Naomi Watanabe is of mixed Chinese and Japanese descent. His father is Japanese and his mother is Taiwanese.
If you look at photos of her when she was a child, you can tell that she wasn't that fat before. She used to have an average appearance, and she didn't have any highlights when she debuted as a comedian.
Later, she was inspired by seniors in the entertainment industry and found her own way out, becoming known to people for imitating Beyoncé.
But if you just imitate Beyoncé, there will be no highlights. She is the only one who can make people shine. She is known as the "flexible fat person". She has a huge body but is not inferior in dancing.
In 2016, she became more famous after appearing on the Red and White Song Festival. In 2017, she started her own fashion brand and became a celebrity in the fashion industry.
Her purpose in creating her own brand is to allow fat girls to dress beautifully. Last year, she also acted in a TV series and sang.
Moreover, her outlook on life is very consistent with her own ideas. She loves to eat and is a gourmet, so she has never been able to lose weight but will gain weight instead.
So there seems to be nothing wrong with calling her "Japan's fattest".