Hayden Christensen's equally maligned and beloved version of Anakin Skywalker has now appeared in two Disney+ Star Wars series. On Obi-Wan Kenobi, he appeared both in flashback as his younger self and in the main story as Darth Vader at the height of his powers. On Ahsoka, he appeared to the title character in the World Between Worlds to teach his former padawan one final lesson and as a Force ghost in the season finale. While these appearances effectively served the stories of both shows, the Star Wars franchise has yet to make the most interesting use of Hayden Christensen's willingness to revisit the role that made him famous.
Source：https://www.cbr.com/ahsoka-anakin-force-ghost-change-star-wars/
