In Irish tales, the legendary hero known for his encounters with the Sidhe is Cú Chulainn. He is celebrated for his extraordinary strength, bravery, and his role as a champion of the Tuatha Dé Danann. Cú Chulainn's interactions with the Sidhe highlight themes of otherworldliness, where he navigates the boundaries between the mortal realm and the magical existence of the fairies. His stories embody heroic ideals and serve as cautionary tales, emphasizing the complexities of honor and fate within the rich tapestry of Irish mythology.