N (Japanese: Ｎ （エヌ）N) or Natural Harmonia Gropius (Japanese: ナチュラル・ハルモニア・グロピウスNatural Harmonia Gropius) is the brother of Lexi. He was the puppet leader of Team Plasma and aspired to create separate worlds for humans and Pokémon, before discovering the true intentions of the team and defecting, before starting again as a Trainer.
N was born as a twin with Lexi in Aspertia City in Unova to mother Johanna and father Ghetsis. When he was born, N was taken by his father, who had decided to leave Johanna. In this time, Ghetsis formed Team Plasma alongside his Seven Sages and began his plot within the Unova region. Years later, Lexi was brought back by Ghetsis. N in this time was isolated from all people and was only allowed to see Pokémon who had been hurt by humans, all the while being brought up as the "King" of Team Plasma. When he became a teenager, he & Lexi were reunited and both began going on excavation missions; in which in this time they found the "famed" Black & White stones. Being Team Plasma's greatest gain, both he and Lexi were crowned Team Plasma leaders.
Shortly after, father Ghetsis confided in him than Lexi was planning to steal the other stone from him and become the sole leader of Team Plasma, wanting to be the most powerful. Ghetsis told him that she should give the stone to him, in order for him to protect him. He did so, unaware that the same story was fed to his sister. When Lexi ran away, both N and his father, alongside Team Plasma continued their work.
The Alexis Saga
N made his first appearance in BW013 in Accumula Town after Team Plasma's public rally and Ghetsis' speech, where he meets his sister for the first time in years - unbeknownst to him of her identity. He again appears outside of the Nacrene Gym, and later at Nimbasa City, where he asks Lexi to talk to him while riding the Rondez-View Ferris Wheel. During this excursion, N reveals that he is the leader of Team Plasma; Ghetsis had asked him to assist him in Team Plasma's liberation of Pokémon. It is confirmed after the ride, when a group of Plasma Grunts address him as their leader, and he battles her to allow them time to get away. He is again encountered at the Chargestone Cave, where he battles Lexi again, and lastly, in Dragonspiral Tower, where he successfully befriends Reshiram.
He returned during the events of The Final Passage, where Team Plasma's plans come to a head. He is located at the League throughout most of the movie, where he battles against Lexi when she uncovers the truth about her past, which sparks N to the realisation also, spiralling the unfolding of the truth to Lexi's defection. N battles against his father, and helps defeat him. Soon after, he departs with Reshiram and Zekrom in toe, to gather his thoughts.