The followers and guardians of the ancient Japanese god Arahabaki, and a type of Shikigami. Some believed that they were the prototype and cognate of Momotaro and Mononofu (same as Samurai; written in Japanese Kanji as 武士).
"A god of war in ancient Japanese mythology. He is a subordinate of another ancient god, Arahabaki. It is said that 'Momotaro', a legendary hero, was based off of him."
—Shin Megami Tensei III: Nocturne Compendium
Momunofu evolves into Arahabaki through leveling up.
Shin Megami Tensei IMAGINE
Momunofu can be contracted in Ichigaya Camp's silver-level instance and appears as an enemy in the gold-level instance.
Shin Megami Tensei: Strange Journey
"A war god of ancient Japan. One of Arahabaki's subordinates. He is said to be the model for the fairy tale hero Momotaro, and is the origin or the word "momunofu," Japanese for "warrior."