This paper considers how the kotoki (political Interpreter) adopted by the Ahoms kings and later adopted by the British to deal with the various hill tribes of Arunachal Pradesh became one of the important element in the Nyishi traditional system. Here I tried to highlight the growth and development of kotoki and its mere role as a messenger to becoming a decision making body in the Nyishi Village Council. The paper focuses on the how the kotoki served as a bridge between the outsiders and Nyishi, which helps in understanding the culture, customs and traditional practices of the Nyishi. It also deals how the Nyishi after remaining isolated for so long gradually opened up to the outsiders though with much intricacy.