Tsuugen is a young man with short black hair and green eyes.
When Natsusa Yuzuki and Sunao Konoe were talking about getting Ibuki Ueoka back, Pongsaklek Yunu was with Tsuugen. He wondered what they were talking about, but Tsuugen told him he doesn't need to learn any of their Japanese.
He is spiritual. In episode 7, Sasaki guides Seiichirou and Pong through meditation so that they be focused.