Riku is a fictional character from the popular video game series Kingdom Hearts. He is known for his silver hair and blue eyes, and he often wears a dark outfit. Riku starts as a friend of the main character, Sora, but his journey takes him through various challenges and moral dilemmas, leading him to explore themes of light and darkness. Throughout the series, Riku evolves from a rival to a hero, showcasing his growth and determination. He wields a keyblade, a powerful weapon in the Kingdom Hearts universe, and plays a crucial role in the battle against various antagonists, including Xehanort.