Kirigakure Shura <Certified>

: Her refusal to have a child is her ultimate act of rebellion. By choosing not to provide a new vessel for the contract, she essentially chooses to end her bloodline to stop the cycle of suffering.

: Shiro didn't just train her to be a Knight Meister ; he was the first person to tell her that she deserved to actually live for herself, not just to fulfill a contract. Kirigakure Shura

Shura’s "deep" content is centered on her tragic lineage. According to the Ao no Exorcist Wiki, she is a descendant of a female ninja clan that made a deal with the snake god . : Her refusal to have a child is

: In exchange for incredible strength and the demon sword "Fang," every woman in Shura’s line is destined to die by age 30 after bearing a child to continue the contract. Shura’s "deep" content is centered on her tragic lineage

: Shura’s hedonistic lifestyle—the drinking, the laziness, and the "living for today" attitude—isn't just a personality quirk; it is a coping mechanism for someone who believes they have no future. 2. Defying "Worth" and Social Expectations