Tadokoro (田所) is picked from the audience to serve as judge for the "Kokuhaku Monogatari" round of the Gachinko Vivage Battle. He is from Saitama and his hobbies are reading and playing Shogi.
He ends up choosing Mimori as the winner after Tsutomu Tomori bribes him.

Anime Debut: Episode 13 (Pixie Garden)
Manga Debut: Chapter 32 (Round 4 - Kokuhaku Monogatari)

(source: http://sketdance.wikia.com/wiki/Tadokoro)