Shuuichirou Oonuma

 Shuuichirou Oonuma' (大沼 秋一郎 Ōnuma Shūichirō'') is a professional mahjong player who also does commentary.

Appearance
Shuuichirou is an old man with balding grey hair and goatee. On his professional mahjong card, he is seen wearing a light brown shirt and a green overshirt, brown pants, and brown loafers, and it is stated that he is 72 years old, 174 cm tall, and weights 68 kg.

Combined Training Camp Arc
Shuuichirou was shown along with Tomoko Horinouchi commenting the Kagoshima tournament. When the match ends, he gives insight on Hatsumi Usuzumi's win.

Etymology

 * The name Shuuichirou means "autumn" (秋) (shuu), "one" (一) (ichi) and "son" (郎) (rou).
 * Shuuichirou's surname Oonuma means "big, great" (大) (o) and "swamp, pond" (沼) (numa).