Sento Kiryu

Sento Kiryu (桐生 戦兎) is a genius theoretical physicist and father of Kiken Kuiki who experiments with Fullbottles to further enhance his abilities as Kamen Rider Build (仮面ライダービルド) to fight against the evil Smash organisms. A man with no memory of his past, he was initially believed to be someone named Taro Satou (佐藤 太郎), but his true identity turned out to be someone else. As war for the Pandora Box breaks out between the three countries, Sento accepts reality for what it is in order to end the war that his previous identity had started. Since the opening of Pandora Box and the resurfacing of his memories, he bands with his former enemies to fight against a common enemy who threatens to destroy Earth.

Marriage to Misora and Birth to Kuiki
Since Sento married Misora, Misora gave birth a baby named Shinji.