Sadako Arayo (粗代貞子, Arayo Sadako) is an exceptional Jōnin ranked Kunoichi hailing from the infamous Arayo Branch of the indominable Rasen Clan, currently residing in Konohagakure. Having been born during the Warring States Period, she was known to be quite the combatant, when for the likes of the best Uchiha and Senju, proving to be a chaotic, and unpredictable obstacle to anyone that approached or engaged her. With a mind solely focused on the promotion of viral growth and prosperity within her clan, she became the cause of the demise of many shinobi.