Darth Maul was reportedly supposed to come back in Obi-Wan Kenobi
According to sources who worked on the Disney Plus show, the villain was written off

Without Darth Vader ruling the galaxy yet, the Star Wars prequels needed a villain who’d have some lightsaber-wielding skills. Thus came Darth Maul, a guy who looked more like a rejected X-Men mutant than someone who’d be as intimidating as the masked heavy-breather, with a head adorned with horns and a Rorschach test-like black-and-red pattern on his face.
After being “killed” in Star Wars: The Phantom Menace and then coming back in the Clone Wars animated series and a confusing cameo in Solo: A Star Wars Story, the Sith Lord was eventually killed by an old Obi-Wan in Star Wars Rebels. Still, the character was reportedly supposed to return in the Disney+ series Obi-Wan Kenobi. The Hollywood Reporter spoke to several sources close to the production, who said Ray Park was supposed to reprise the role in the series.