Tocharians are very interesting people. The red haired mummy. Ancient Chinese literature had accounts of red and blonde hairs with blue or green eyed people amongst them. They were White emperors, shamans, and generals. I would not be surprised if Koreans and Japanese have some Tocharian in them.
I agree...they definately have Ainu genes but, I'm not sure if there is a relationship between the Tocharians and the Ainu/Jomon of Japan.
There are Chinese poems lamenting the green eyes of some of the Han emperors and the 'magic men' of the emperors were documented in Chinese literature to have had red hair.