Ummon derives his name from the ancient Chinese Zen master Yunmen Wenyan, whose name is translated as Ummon in Japanese. Like his namesake, Ummon has a fondness for speaking in koans, using them to illustrate concepts when communicating with lesser intelligences. He also frequently uses the exclamation "kwatz!" as an expression of humor; this is another element taken from Zen teachings.
Ummon's fate remains uncertain. It is possible he was destroyed shortly before the fall of the Hegemony, dismantled by other AIs during the civil conflict within the TechnoCore.