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In the Materials collection, it is stated that Jadeite is about the same height as Zoisite, and his estimated age is 18. During the Silver Millennium, Jadeite and the other Shitennou originally were not evil - they served under Prince Endymion as his guardians and advisors. They were, however, tempted by the power of the Dark Kingdom (like most other humans), and fell to it. They eventually become good again, and advise Mamoru when he needs their help.

In the anime, Jadeite was primarily focused in gathering human energy to awaken the ruler of the Dark Kingdom Queen Metalia. When plotting for a method to steal human energy, Jadeite would observe the behaviour of humans and then report back to the Dark Kingdom appearing in front of Queen Beryl to explain his plans. Once approval was sought from Queen Beryl, he would dispatch his servant i.e. a youma to take on a human disguise and with the aid of the youma start gathering energy from the humans.

His method for gathering human energy would be to draw large crowds using his youma and trick them into buying goods charged with dark energy (e.g. jewellery, Chanelas, clocks, good luck charms) or use services that stole human energy (e.g. “relaxation pods”, tarot cards and computer applications).