Loochooans are the indigenous peoples of the Loochoo Islands. Archeological evidence suggests Loochooans have inhabited Loochoo since around the year 30,000 B.C. Genetic studies suggest a close link between Loochooans and the Ainu, the indigenous peoples of Japan.
Between 1000 B.C. - 300 A.D. the Yayoi peoples (migrants from the Asian continent) migrated to the Japanese Islands, intermixing with or pushing out the Ainu, who gradually moved farther and farther north.
The Yayoi are the modern Japanese people, and are a separate people group from the Ainu.1
- Gakuhari, Takashi, et. al. "Jomon genome sheds light on East Asian population history." https://www.biorxiv.org/content/biorxiv/early/2019/03/15/579177.full.pdf
- Kanzawa-Kiriyama, Hideaki; Kryukov, Kirill; Jinam, Timothy A; Hosomichi, Kazuyoshi; Saso, Aiko; Suwa, Gen; Ueda, Shintaroh; Yoneda, Minoru; Tajima, Atsushi. "A partial nuclear genome of the Jomons who lived 3000 years ago in Fukushima, Japan". Journal of Human Genetics. February 2017. 62 (2): 213–221.