Enju is an orange-haired oni whose horns remain hidden beneath her odango or twintail hairstyle. Her eyes burn orange or red. Posing as a benevolent nun from the Sun Stellar Church near Akagi Highschool, she extends kindness to humans like Tōru Takagami. This disguise masks her true quest: to locate the rare white oni, Byakki. Enju believes Byakki's power to imprint a ruler is the key to creating a homeland for her people, a group of homeless oni outcasts she leads. She intends to use this power to become their queen and secure their survival, driven by profound responsibility for her race.

Her methods are pragmatic and often ethically ambiguous, involving dealings on internet black markets to acquire potent magical artifacts and services through intermediaries like Inamochi. Despite her fierce determination, Enju maintains moral boundaries; she refuses to kill Tōru Takagami—Byakki's imprinted parental figure—even though his elimination would ease her claim on Byakki. She also demonstrates concern for innocent bystanders, warning them to flee before dangerous confrontations. Her leadership inspires deep loyalty among her followers, who trust her decisions implicitly. Enju embodies the constant reckoning between her compassionate core and the harsh measures she considers necessary for her people's future.