Are Thais Fully Mongoloid?

[Gohenk]

I have always wondered this as some of them can be quite dark with robust and australoid-like features like the fighter Buakaw Banchamek, for instance.

[Leto]

Generally speaking, Southeast Asia has a Negrito-related substratum as well as more recent South Asian influence but that must depend on the country and specific region. Regarding the Thai fighter you mentioned, I've looked him up, he is from this province:
https://en.wikipedia.org/wiki/Surin_province

Surin is a province with a sizable Northern Khmer population. It was reported that 47.2 percent of the population are capable of speaking the Khmer language. This is down from the 1990 census where it was reported that 63.4 percent of the population spoke Khmer.[20]

A third large minority group, the Kuy people, also reside in Surin. Also spelled "Guay", "Suai" or "Kha" (pejoratively), the Kuy are a Mon-Khmer people distantly related to the Khmer and considered by many Thais to be the aboriginal inhabitants of the region. A 1985 study found that 9.6 percent of the people in Surin were Kuy, 9.2 percent were mixed Lao-Kuy, and 3.1 percent were mixed Khmer-Kuy.[citation needed] Kuy people speak the Kuy language and most traditionally followed animist beliefs although a syncretic blend of animism with the local Theravada Buddhism is now more common.

So the province is majority Khmer or something similar and Cambodians are dark as a mofo, many look almost Indian.

[Nurzat]

on top of the South Asian-like genes people in southeast Asia have by default, he is ethnic Kuy, a mountain people inhabiting a region between Thailand, Cambodia, Laos and Vietnam, that may have a particular genetic composition (might have some Negrito component as well, who knows)

[Sora]

Afaik Thais & other Southeast Asians have at least 10%-20% Ancestral South Indian + 1%-6% Caucasoid heritage. So the SE Asians have only 70%-90% Mongoloid on general

[Petalpusher]

They are about 1/8 "Caucasian" or at least something West Eurasian. That's the most in East Asia and SEA.

It shows from time to time imo, eventhough the vast majority of the population looks mongoloid/sea.

[Gohenk]

They are about 1/8 "Caucasian" or at least something West Eurasian. That's the most in East Asia and SEA.

It shows from time to time imo, eventhough the vast majority of the population looks mongoloid/sea.

I found this Thai guy in a random video.
He is quite dark and have an almost Indian look but you still can see the mongoloid in him: