Azuma Umi was the Grandmaster of the Acua Clan. He was killed during the Siege on the Hidden Lake Palace by Oran Mandarin.
Azuma was a known benevolent leader who was disgusted by the rule of Shen Gikoku. He refused Shen's offer to re-annex the Acua Clan with the Dominion of Kyloto nineteen times. He was strangled to death after a one on one fight with Oran Mandarin.