Yuugo Tennouji, known as Mr. Braun, runs the Braun Tube Workshop in Akihabara and acts as Rintaro Okabe's landlord. He is a tall, muscular man with a bald head, a beard, and green eyes. He typically wears a yellow shirt and a blue apron featuring the "I Love CRT" insignia, signifying his dedication to cathode-ray tube televisions. Orphaned in Paris, he survived in the sewers until SERN recruited him following his witnessing of a gellified human. Relocated to Akihabara in 1996, he met Suzu Hashida (Suzuha Amane from a future timeline) and Tsuzuri Imamiya, his future wife. Suzu provided him shelter after he deliberately burned down his home to evade SERN; she later sold him the building housing his workshop and Okabe's lab. Tsuzuri died during her second pregnancy, gellified by SERN to coerce his loyalty, cementing his coerced servitude to the organization. As the SERN Rounder commander "FB," Tennouji manipulated recruits using personas tailored to their psychological vulnerabilities, such as presenting as a woman to recruit Moeka Kiryuu. He led a double life, monitoring Okabe's lab while maintaining a gruff but caring facade as landlord and father to his daughter, Nae. His primary motivation was protecting Nae from SERN. In the original *Steins;Gate* narrative, his identity was exposed by Okabe and Moeka. Learning Suzuha Amane sought to dismantle SERN's dystopia—contradicting his own actions—he committed suicide to protect Nae and Moeka from SERN's retribution. The visual novel depicts his solitary suicide, while the anime shows him fatally shooting Moeka before killing himself. In *Steins;Gate 0*'s beta worldline, altered time-travel events meant Tennouji never met Suzu Hashida, resulting in a colder, more pragmatic personality. Still a Rounder, he allied with Okabe after Nae witnessed attackers targeting Kagari Shiina and Suzuha Amane. He sheltered both girls at his shop, using his interrogation skills to extract information from a Stratfor agent about Kagari's pursuers. This cooperation stemmed solely from his goal to protect Nae, lacking the prior moral conflict from Suzu Hashida's influence. Across media, Tennouji's arc underscores his duality: a ruthless enforcer capable of torture and murder, yet driven by paternal devotion. His survival in the Steins Gate worldline is confirmed in *Robotics;Notes*, where he continues running his shop and caring for Nae.