Jar Jar Binks is arguably the most hated character in the entire Star Wars saga. His overall wackiness and unintelligible dialect really bring down The Phantom Menace at times.
George Lucas apparently is the only human alive who thinks this bumbling buffoon of a character is funny and featured him much too prominently in the first prequel. He thankfully toned down his role in the latter two chapters of the Prequel Trilogy, all but admitting his mistake on the character.
That did help, but when anyone mentions this crazy Gungan, faces cringe, and his memory is met with much chagrin.
Now Jar Jar doesn’t need to be in The Rise of Skywalker himself, but seeing a member of the Gungan species who isn’t as annoying, would be a nice touch. It could be as a quick shot of a pilot, or a fighter in the final battle, but it would make sense to see one of these amphibian looking creatures in the final film.
The Gungans proved to be capable fighters in the battle of Naboo and helped out the Republic early in the saga. There is no reason to think they wouldn’t be willing to fight the First Order at the end of the story as well.