In the final chapter of the Sand Dune quartet, the God Emperor of Sand Dune, Leto II became an existence that surpassed humans, possessing longevity and superhuman abilities. He ruled over mankind for 3,500 years, subverting the old religions and becoming the supreme authority of the integration of politics and religion. His body was gradually mutating, approaching the critical point of turning into a sandworm. He had cultivated an ideal heiress through a breeding program, but she had resisted him. Leto II fell in love with a woman, Hwa, who was sent here, but he was eventually assassinated. His skin disintegrated into sandtrout and returned to the land. Each sandfish carried a part of his consciousness. In the Dune series, Leto II was a ruler with superhuman abilities. His story was full of drama and conflict.
Leto Atreides II was an important character in the Dune series. He was the twin son of Paul Muad 'Dib and Chani, born with ancestral memories. Leto II had extraordinary talent and abilities. His body had also undergone a mutation, and he was close to becoming a sandworm. He established a new universe in Son of Dune, overthrew the religious regime established by Paul, and ruled mankind for 3,500 years. However, his rule was eventually overthrown, and the Atredis Dynasty came to an end. There was no detailed explanation of Leto II's specific purpose and the meaning of the Golden Passage.
Leto II fused with the sandworm and fused the sandtrout with his skin, turning him into a Sandworm Man. This allowed him to have the skin of a sandworm and extremely strong physical strength. At the same time, he also obtained a lifespan of up to 4,000 years.
One great Percy and Leto fanfiction could be 'Percy's Encounter with Leto'. It might explore a scenario where Percy stumbles upon Leto in a hidden grove. The story could delve into their initial meeting, with Percy being in awe of Leto's divine presence. Another could be 'Leto and Percy's Quest', where they team up for a mission that requires both Percy's skills and Leto's wisdom. There's also the possibility of a fanfiction that focuses on a friendship between them, like 'Percy and Leto: An Unlikely Bond', which shows how their different natures can complement each other.