Dr. Hausen is a supporting character in Kuromukuro, first appearing as an eccentric researcher affiliated with the United Nations. He makes a particularly significant impact in the final episodes of the series, where his true nature and connections to other characters are revealed. One of the most notable facts about his background is that he is the biological father of Jundai Kayahara, one of Yukina Shirahane's friends from the Tateyama Preparatory College. It is also revealed that he is divorced from Jundai's mother, a separation that occurred because he chose to prioritize his scientific research over his family life. This personal history explains the somewhat distant relationship between father and son.

In terms of personality, Dr. Hausen is often perceived by others as a mad scientist, an impression that stems from his intense and unorthodox dedication to his work. He possesses a daring and perhaps reckless attitude toward his research, a trait that is implied to have been passed down to his son Jundai, who is known for his own audacious and fearless behavior. His driving motivation is clearly his research, which he values above almost everything else, including personal connections. This singular focus defines his actions and his role within the story. He is not a field operative or a pilot but a man of science, working within the UN organization to understand the advanced and often alien technology that forms the core of the series' conflict.

Dr. Hausen's role in the narrative is primarily that of a scientist and analyst, but he becomes crucial to the plot in several key moments. He is present at the UN and is the one who makes the critical discovery that Yukina Shirahane and the Efidolg pilot Muetta share identical DNA. This revelation leads him to the conclusion that Yukina was captured by mistake, as the enemy forces had likely intended to abduct Muetta. This discovery is a major turning point for the characters and the rescue mission. In the series finale, his role expands further. After the main conflict subsides, he is given significant authority to conduct experiments on both Muetta and the surviving Efidolg pilot. He is also known to administer a specific medication intended to combat fatigue, though there is a notable concern that this substance could potentially interfere with the nanomachines that grant Kennosuke and Muetta their conditional immortality. Despite his cold demeanor, he also provides Yukina with a special bauble, a device that later allows her to confirm that Kennosuke is still alive, proving that his actions, while scientifically driven, can have unexpectedly benevolent outcomes.

Key relationships for Dr. Hausen include his strained familial connection to his son Jundai, whom he largely neglected in favor of his work. His professional relationships are with the other UN staff, though he operates somewhat on the fringes due to his unusual methods. His authority over Muetta in the post-conflict setting places him in a complex dynamic with the alien pilot, as he is the one who oversees the fitting of a controlling collar on her. This act demonstrates the uneasy and often inhumane measures taken in the name of security and scientific progress. Regarding his development, Dr. Hausen does not undergo a dramatic personal transformation, but his role evolves from a background researcher to a central figure in the epilogue. He transitions from simply analyzing the conflict to actively shaping the post-war world, using his expertise to further humanity's understanding of alien technology, which ultimately leads to the development of interstellar flight. As for notable abilities, Dr. Hausen possesses no combat skills, but his scientific and analytical expertise is formidable. He is highly proficient in fields related to archaeology and alien technology, capable of analyzing DNA, reverse-engineering advanced equipment, and conducting high-stakes experiments on subjects of immense importance to global security.