Duncan Idaho is a fictional character in the Dune universe created by Frank Herbert. He was introduced in the first novel of the series, 1965's Dune, and became a breakout character. He was revived in 1969's Dune Messiah. From Wikipedia
The new casting underscores a significant time jump in Denis Villeneuve’s final Dune instalment, paving the way for Jason Momoa’s return as a ghola.
