In addition, as to the roots, it is said that they originated from various places such as from the Yellow River basin to the Shandong Peninsula, the Yangzi jiang, or from Manchuria to the Korean Peninsula, and until now still the subjects of discussion are the roots and the scale of torai (one compelling theory is that Toraijin mostly came from the North East Asia according to the latest genetic research).
また、そのルーツに関しても、黄河流域～山東半島、揚子江流域、満州～朝鮮半島など様々で、渡来の規模とともに今なお議論の対象となっている（最近の遺伝子研究ではおおむねにおいて渡来人は北東アジア起源が有力である)。