Kankou

神晃

Kankou (also known as Umibouzu, 星海坊主) is the father of Kagura and Kamui and one of the last surviving members of the Yato clan. Like Kagura, he uses an umbrella in combat, though he is also depicted as formidable in his own right. He is among the few characters capable of overpowering Kagura. He appears when an alien takes control of the Terminal, assisting the Yorozuya in defeating the creature. It is revealed that he possesses a cybernetic arm.
After departing to travel the galaxy in pursuit of aliens, he is next heard from via a letter. In it, he informs Kagura that Sadaharu is also a monster they should eliminate. In the anime, he becomes the leader of the "Principality," having been recruited by a doppelganger of Char Aznable. In the manga, he is recruited by a lookalike of Darth Vader.
Later in the manga and anime series, he also appears in a hair growth shampoo advertisement, which the Yorozuya complain is excessively long.
Hideaki Sorachi revealed in a Q&A in volume 57 that Umibozu's real name is Kankou.