Harumi (nicknamed Rumi) is the former princess of Ninjago and the founder of the Sons of Garmadon as the Quiet One. After losing her parents during the rampage of the Great Devourer, Harumi was adopted by the Emperor and Empress of Ninjago and became the Jade Princess. For years, she sought vengeance against the ninja for allowing her parents' deaths, and she admired Lord Garmadon, who killed the Great Devourer himself. The ninja begin to safeguard Harumi and the Royal Palace when the Sons of Garmadon rise to prominence. After the palace is destroyed and her adoptive parents are killed, Harumi joins the ninja and is protected by Lloyd, who she fakes a close relationship with. After sabotaging the ninja's plans, she and the Sons of Garmadon seize the three Oni Masks and use them to resurrect Garmadon as a soulless incarnation of his former self. After the ritual supposedly fails, Harumi is arrested, but her act was successful and Garmadon is revived. The dark lord frees her and her allies from prison. She watches as Garmadon fights and defeats Lloyd in Kryptarium Prison, after which he creates the Colossus. Harumi pursues Lloyd and a young Wu, who is presumably killed with the original ninja after Destiny's Bounty is destroyed. Harumi serves Garmadon as he rules Ninjago, often running missions for him to help hunt down Lloyd's Resistance. When a mental battle for the Colossus breaks out between Skylor and Garmadon, Harumi saves a child and his family from suffering the same fate as hers. Harumi perishes when the Colossus strikes the building she's in, causing it to collapse. Before she can pass onto the Departed Realm, Harumi finds herself in a void with the Overlord, who coerces her to help his cause in exchange for her revival. She reluctantly agrees, and is resurrected - unbeknownst to Garmadon and the ninja. As the herald of the Overlord, Harumi establishes the Crystal Temple as a base of operations, and begins building an army out of Vengestone. Under the secret identity of the Kabuki Mask, she assembles and commands a council of the ninja's past enemies, including Pythor, Aspheera, Vangelis, The Mechanic, and Mister F. After Lloyd is captured by the council, Harumi oversees the Overlord's rebirth as the Crystal King, and leads his generals as they wage war in Ninjago City. For much of the final battle, Harumi remains atop the Overlord's floating temple, and witnesses his battle against Lloyd and Garmadon. After learning the Overlord was responsible for corrupting The Great Devourer and indirectly causing the deaths of her parents, Harumi betrays him and sides with the ninja. After the Overlord and his armies were defeated, Harumi makes amends with Lloyd, and later helps with rebuilding the Monastery of Spinjitzu.