Yugo Tennouji is one of the main antagonists of the visual novel and anime series Steins;Gate. He is the owner of a CRT store, Rintarou Okabe's landlord and the father of Nae Tennouji. While seemingly a neutral character for most of the story, he is eventually revealed to be an agent of SERN and the true leader of the Rounders, who manipulates Moeka Kiryuu from behind the scenes under the codename FB.
He is voiced by Masaki Terasoma in the Japanese version and Christopher R. Sabat in the English version, the former of whom also voices Souichirou Kuzuki.
Yugo is a tall, muscular man in his early thirties with a bald head and a short-boxed beard. He wears a yellow shirt with a blue apron that reads "I Love CRT" over it.
He has a great passion for CRT Television and refuses to upgrade to any other type. This coupled with the fact he owns a CRT store has resulted in Rintarou nicknaming him "Mr. Braun" after the inventor of CRTs, German physicist Ferdinand Braun and the common Japanese name for CRTs, "Braun Tubes".
While appearing as a tough and menacing man and often using this demeanor to jokingly bully Rintarou, he actually has a soft spot for the lab members and cares about their well-being. His daughter Nae is his top priority and he will go to desperate lengths to ensure her safety.
Yugo has a bad temper, and is very easily annoyed by Rintarou's mannerisms as well as his "experiments" upstairs. He regularly threatens to raise the lab's rent money should the experiments continue to disturb him, though this has never actually happened.
In the presence of both his daughter and Rintarou, he would often attempt to "protect" her from Rintarou, whom he sees as a "pervert", though he was likely joking.
Yugo is later revealed to be under constant stress and guilt, afraid that if he disobeys SERN, they will kill him, Moeka, Suzuha and Nae like they did his wife and unborn child.