Reika Shimohira is a prominent character in the manga and anime series 'Gantz.' She is a famous idol and model who finds herself caught in the deadly game orchestrated by the mysterious black sphere known as Gantz. Despite her initial reluctance, Reika becomes an integral part of the team due to her quick reflexes and determination. Her character evolves as she forms complex relationships with other players, including a deep admiration for the protagonist, Kei Kurono. Reika's journey explores themes of survival, identity, and the cost of fame in a chaotic and dangerous world.