Nikolai Yerkovich Petrov

ニコライ・ヤーコヴィッチ・ペトロフ

Partner: Sashenka (Gaomon) Nikolai Yerkovich Petrov, also known as Niko, is Taiga's close friend. Niko lives in the same building as Taiga, and is player of Digital Monster who ranks in the fourth place. (Source: Digimon Wikia)