Nephrite

ネフライト

Nephrite (known as Nephlite in English adaptations) is the second Shitennou to appear and holds the second-highest rank. Takeuchi characterizes him as cocky and emotional, noting that he will likely get himself killed right away, which indeed happens in the manga. He is the second-oldest, estimated to be around 19 years old, and oversees the Dark Kingdom's North American division. His name derives from the mineral nephrite.
In the manga, Nephrite's main objective was to find the Silver Crystal. The death of the first king, Jadeite, enraged Nephrite, and the desire to avenge his fallen comrade became the primary motivation for his actions. Nephrite would attack his victims using a "shadow" of himself, which would possess them, allowing him to control their bodies while simultaneously draining their energy. His final and only scheme involved possessing Motoki, who then passed this corruption on to Makoto. Mamoru rescued them from the Shadow, and in retaliation, Sailor Jupiter struck down Nephrite, killing him.
In the anime, Nephrite assumed Jadeite's position after the latter was banished into Eternal Sleep by Queen Beryl. He criticized Jadeite's methods of collecting energy, explaining that Jadeite tried to attack too many people at once. Nephrite hypothesized that he could extract more energy from a single person than Jadeite could from a hundred, based on a person's intonation with the stars. Nephrite could tap into this natural rhythm to identify people reaching their maximum "energy potential" and then drain it for Metaria. In the anime, Nephrite used the alter ego Masato Sanjouin, assuming the identity of a wealthy businessman who drives a red Ferrari 512TR Testarossa. Although he acts like a typical human, he occasionally demonstrates some super-human abilities, such as easily leaping over a tennis court fence. Over the course of his missions, he inadvertently attracts the attention and affections of Naru. After many attempts to simply gather energy, many of which Queen Beryl deemed successful, he resigned himself to locating the Ginzuishou. This infuriated Zoisite, the third king, who relentlessly taunted and ridiculed him. Nevertheless, Nephrite managed to develop a homing device to track down the Ginzuishou—in the form of a Black Crystal (Kurozuishou). Oddly enough, the Black Crystal would only react to the presence of Naru, and Nephrite correctly assumed it was reacting to the power of her love for the king. In the end, Nephrite also developed feelings for the redhead, which gave Zoisite the necessary edge to eliminate the former king. Zoisite's minions captured Naru, whom Nephrite summarily rescued. In the process, he admitted his feelings for the girl and gave a genuine smile, as well as a good laugh. Then, Zoisite's minions attacked again, and Nephrite took a piercing vine through his shoulder to protect Naru, as well as a direct attack from another assassin. In the midst of the attack, Nephrite dropped the Black Crystal, which Zoisite then obtained. The Sailor Senshi arrive to destroy the minions, but Nephrite is already beyond saving, professing his regret for lying to Naru so much, and soon dies in her arms.