Tsunade is a major character in Naruto, known as one of the legendary Sannin and one of the strongest medical-nin in the series. She becomes the Fifth Hokage of Konohagakure, taking on the role of village leader and protector. Tsunade is famous for her immense strength, healing abilities, and fear of blood due to past trauma. She plays a key role in guiding Naruto and helping defend the village during major conflicts.