Kirigakure Shura -

: Her initial desire to kill Rin was fueled by her loyalty to Shiro; she couldn't understand why he would sacrifice his life for the son of Satan. Her journey as Rin’s mentor is her way of finally understanding Shiro’s "selfish" kindness. 4. Meaning of the Tattoo

: 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. Kirigakure Shura

: 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. : Her initial desire to kill Rin was