Uchuu Munakata leads the wealthy and influential Munakata family, a household wielding significant control over Japan through its extensive connections. He is married to Sora Munakata, characterized as smart and adventurous. Their family includes two daughters: Umi Munakata, exhibiting a headstrong and capable personality whose hobby of collecting unusual pets often unnerves others, and Riku Munakata, who possesses exceptional talent in finance and mathematics and frequently engages in intellectual discourse.

The Munakata lineage is one of three families entrusted with safeguarding a Zenon Guardian battleship and its corresponding robot, specifically the unit linked to Hokkaido. This duty originated during the Edo period when three space capsules bearing the Zenon Guardians landed in Japan. Alongside the Kamui and Makinohara families, the Munakatas have preserved these artifacts across generations.

As patriarch, Uchuu oversees the family's considerable resources and connections during the Zenon Empire's invasion of Earth. Their battleship and guardian robot contribute to humanity's defense against this extraterrestrial threat, though specific personal actions or development by Uchuu throughout the conflict remain undocumented.