Reiju can be kind and empathetic, but this is frequently masked by a cool, callous demeanor due to the militarism of her family and her father's stern disdain for compassion. Reiju prefers to show kindness only when it will not endanger her own comfort or safety. Unlike her brothers, excluding Sanji, she is compassionate and kind hearted, and treats others with mercy and respect less it puts her in danger. All of Reiju's siblings, excluding Sanji, are extremely violent and merciless.