Lexa is a fictional character from the television series The 100, which is based on a book series by Kass Morgan. She is portrayed as a strong and strategic leader of the Grounders, a group of survivors living on Earth after a nuclear apocalypse. Lexa is known for her tactical skills and her commitment to protecting her people. In the series, Lexa forms a significant alliance with Clarke Griffin, the protagonist, which leads to complex political dynamics and emotional connections. Her character is notable for exploring themes of leadership, loyalty, and the challenges of uniting different factions in a post-apocalyptic world.