Physically, the Ainu stand out distinctly from the Japanese as a separate ethnic group. Ainu people tend to have light skin, a stout frame, deep-set eyes with a European shape, and thick, wavy hair. Full-blooded Ainu may have even had blue eyes or brown hair. In the past, the Ainu were proposed to be of Caucasian decent, given their appearance, but recently it has been proved through dental morphology and fingerprinting that the Ainu are in fact Mongoloid, not Caucasoid.

These days, the concept of a pure Ainu is very blurred. Distinguishing the Ainu from other Japanese is almost impossible due to intermarriage with the Japanese, migration, and denial of the Ainu identity to avoid discrimination."

From: https://www.tofugu.com/japan/ainu-japan/

One interesting point about Ainu is that it does not have a written form. The language has lived by being passed down from parent to child for countless years and has historically been transcribed using Japanese kana. The lack of a writing system has of course hindered the ability of the Ainu to preserve their language after it was banned, and the use of Japanese kana has even influenced some Ainu pronunciations. Even so, the language has been able to live in the tradition of Ainu story telling, or Yukar, the language of which is mutually understood by all Ainu groups and is known as Classical Ainu."

From: https://www.tofugu.com/japan/ainu-japan/

The year 1994 marked a great turning point for the Ainu people, as the first ever Ainu, Shigeru Kayano, entered the Japanese diet. Shigeru dedicated his life to promoting the well-being and awareness of the Ainu people. It was thanks to him as well as other supporters that the law forbidding Ainu culture was lifted in 1997. Since then, government funding and cultural freedom has allowed the Ainu people to start regaining and preserving their precious way of life through Ainu language courses, radio stations, and public performances.

Still more recent landmarks in Ainu history include the official recognition of the Ainu as the indigenous people of Japan in 2008 and the formation of the Ainu political party in 2012. It seems that while there is still some discrimination of the Ainu people, those who rejected their heritage before are beginning to admit it openly or even embrace their identity with pride."

From: https://www.tofugu.com/japan/ainu-japan/