Anthea
Anthea is N's sister and basically helped raise him alongside their other sister, Concordia (who also goes by Helena). Growing up together, she's stayed close to her brother—maybe a bit too close, if you ask fans. She's known for being overprotective of him, which comes through pretty clearly in how she acts around him.
Like Concordia, Anthea has the ability to teleport and can communicate with Pokémon, understand their feelings and needs in a way most people can't. It's one of the things that makes her stand out, though it's also just kind of normal for their family.
Content compiled by AnimeList.moe from publicly available sources.