Sadao Omigawa

Sadao Omigawa is a forty-two year old Japanese man living in Karasuto. He is the maternal uncle of Chiaki, as well as the owner of Omigawa Odd Jobs, an odd job shop where Takumi eventually winds up working.

Bio
The older brother of Kami Omigawa, he attended college in America alongside his sister. While there, he was roommates with Victor Altman; despite their differing personalities, they became close friends. Sadao was very supportive of the relationship between Kami and Victor, and despite his distaste for children, he has always been especially fond of their daughter Chiaki. After graduating from college, he returned to Japan and opened up an odd job shop, claiming to have failed in securing a career in his desired field. He was saddened when he heard his sister and best friend had gotten divorced, especially due to the circumstances. When Chiaki came to Japan to study abroad and asked if she could stay with him, the man eagerly agreed. When Takumi lost his job and was evicted from his apartment, he graciously offered to allow him and Shiko to stay with them, under the condition that the former would earn his keep by working for him.

Personality
A warm (albeit strange) man, he has a love of science, technology, and history. When he's not busy running his odd job shop, he's hunting down antique items, which he collects as a hobby. Despite graduating from college with honors, he seemingly has no desire to pursue a career in the field for which he got his degree, medical science. Instead, he prefers to remain in his humble profession of shopkeeper, living a relatively calm and stress-free life with his niece. Although he seems naïve on the surface, he is quite intelligent. He knows of Takumi and Shiko's true natures, although how he deciphered this has yet to be seen. He acts as a mentor figure to Takumi, giving him advice and indirectly assisting him in his fight against the Grimm along with the others.

Trivia

 * His character has some similarities to Stein, a supporting character from the manga series Soul Eater; however, said similarities are fairly minor and mostly surface level.
 * His role as the caretaker of Chiaki and a mentor to the Main Rider mirrors that of Soichi Isurugi from Kamen Rider Build. He also share similarities with Junichiro Tokiwa from Kamen Rider Zi-O (Namely the fact that he serves as the Uncle to one of the series' main characters, and collects antiques.)