Does "Mittlesinid" and "Sudsinid" even exist? A southern Fujian Sudsinid will differ to a Guangxi Sudsinid, and even places like Hunan/Hubei have their own distinct "Sudsinid".  

"Nordsinid"...sort of exists? There is a specific north China distinct pheno that is consistent across all northern/central regions, but the latter categorisations should not exist.

What traits does Ma Huateng have that look distinctly Teochew?

Young Li Ka-shing look southern shifted than I expected due to his bigger eyes, mouth and nose area. Do you have other pictures of him in his youth?

Have you seen anyone else who look like James Ma? I believe you are right regarding him look distinctly Sino-Thai. Do you see any southern shifted traits in him?

Interesting, I feel some of my relatives look more northern shifted than Mr. Chen though. 

Okarina, you are correct to point out that yes, it does seem that SEA Chinese differ to PRC South Chinese in features, but I do not know if this is due to genetic differences or due to some growth pattern. I think Thai/SEA Chinese like James Ma are mostly genetically fully Chinese, but their environment/upbringing changes their features via different foods/exercise/chemicals. 

Likewise, a similar effect is seen on Chinese Americans/Australians. Northern Chinese males that are born in the West for example, are 80%+ narrow/small faced and skinny with oval rounded faces, while Millenial/Gen Z North Chinese males in China are oftentimes squarefaced and less skinny, with more bone definition. For example, this Hengshui high school student's face, simply does not exist on same region ABCs, as the jaw area is too abrupt. Cantonese Australians/Americans likewise have more rounded bones compared to those born in China, who are oftentimes squarer.

That's because you haven't seen enough PRC South Chinese, really these SEA Chinese still look noticeably Chinese and noticeably Fujianese, and I can easily find more southern-shifted and more gracile-looking people from my GD, GX, and YN acquaintances.

Oversea Chinese only represent a very small subset of their provinces of origin, and aren't the best example to use or cite when judging phenotype variations among mainland Chinese. There're many robust and squarish looking individuals in Northern China, I've seen such features quite commonly.

And I'm not sure why you think mainland Cantonese are squarish, IMHO people from western GD and GX as well as the surrounding Tai-Kradai minorities are the most gracile people in all of China, oftentimes being very thin-boned. And they're also the most southern looking, often surpassing the southern-ness of SEA Chinese.

With Ma Huateng the "gracile" SEA-like regional vibe is more obvious in older photos where he looks visibly younger.



compared to 




I'm not saying visibly admixed SEA Chinese can't pass in Mainland China either, but I do think the native Indonesian-like vibe Anna En, Terence Then ("Hokkien beng" in the video), and Benjamin Kheng have (maybe it's harder to see with just one stock photo/video each) is slightly different from the Daic-shifted vibe Pearl River basin Chinese tend to have. Ben Kheng is almost certainly Peranakan even if Anna En and Terence Then might not be.

James Ma having partial Thai Chinese ancestry doesn't rule out the possibility of him having actual Siamese/Mon/whatever ancestry. He doesn't look obviously not-Chinese the way fellow Thai national Sornnarin Tippoch or wrestler Dolgorsürengiin Serjbüdee do, but if I didn't know who he was I'd guess him as SEA Chinese before PRC, TW, or HK Chinese due to looking vaguely Thai.

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How well do Thaksin Shinawatra and his daughter pass in Guangdong?

A lot of the times the perceived differences between mainland Chinese and oversea Chinese come from differences in fashion, styles, make-up, and facial expressions rather than actual phenotype differences.

Mainland Chinese students especially guys tend to have this very old-fashioned bowl-cut which tends to exaggerate their facial width, and combined with a high percentage of myopic students wearing thick glasses this tends to create a rather stark visual difference between them and oversea Chinese which tend to have better hairstyles and more often than not wear contact lenses rather than glasses. However if the two are having the same style than the differences would be much smaller almost negligible.

And there's also the issue of weight. Mainland Chinese culture tends to put more pressure on women to stay in shape and much less aesthetic pressure on men, hence the reason why there're more overweight men than women in China; and for overseas Chinese I feel it's exactly the opposite, the aesthetic pressure on men is higher than that on women. Hence the reason why you see more fit small-faced ABC guys compared to mainland Chinese guys, but for women it's the opposite.

And Beijing is a typical example of how weight influences phenotype. According to statistics Beijing ranks the top among Chinese cities in terms of obesity, with nearly 25% of Beijingers being either overweight or obese. If you've ever been to Beijing you'd surely notice that the breakfast in Beijing is very high in carbs and in sugar, for instance fried doughs the size of my small arm, or sweet deep-fried pancakes twice the width of my face, not to mention the various types of steamed buns, noodles, cakes, animal organs cooked in deep oil, etc. No other place in China has as heavy a breakfast as Beijing. I've watched many online streaming from different parts of China that's why I'm quite accustomed to the phenotype differences among Chinese, but the food differences are equally striking. I remember I've watched two ethnic Ayni / Hani girls from Yunnan having breakfast and their version of fried dough was like only 1/3 to maybe 1/4 the size of the one in Beijing, and when they ate it they dipped it in a bowl of chili sauce as opposed to dipping it in soy milk. And they also drank a type of vermicelli soup with vegetables. And I've watched two ethnic Hmong / Miao girls from Guangxi having breakfast and their breakfast was a small bowl of tea porridge or tea congee. That's how the South Chinese stay in shape.

Really when talking about Chinese food being heathier than western food one must exclude Beijing food from the list cause that's definitely not the case.

With the exception of southern minorities in China, I would say that all Chinese food is unhealthy and worse in nutrition than western food. In the West it is true that McDonalds diet people are obese, but middle class White people definitely eat healthier than average Chinese people. They eat a lot of cold meats, salads and many are very nutrition/diet obsessed compared to Chinese people. Even unhealthier options like burgers aren't even that bad compared to sodium oil packed baozi. Also Chinese people eat a ton of weird snacks, like Latiao, which is worse than Chocolate imo for health. For bulk Chinese people today, their diet is this oily fatty mess packed with sodium and carbs.

Anecdotally speaking, after eating a large Chinese meal, I feel tired and sluggish. But after eating a burger and a sandwich, I feel more mobile and energetic.