This list has already discussed one additional Jedi who felt more like a number bolsterer than a significant character, and now it's time to talk about the other. Ki-Adi-Mundi is yet another Jedi who, despite getting little screentime or dialogue, did grab the viewers attention. He would be expanded - like Plo Koon - in the animated Clone Wars series and Star Wars comics, but he still feels like an underappreciated character.
He edges out Ben Solo and Plo Koon because he at least gets some decent moments in the prequel trilogy. For example, his demise during Order 66 was one of the most memorable, as you got to see him in action with his saber fighting to the bitter end.
Overall, Mundi's character revolved around the idea of being logical and having a great mind for strategy. This is something that could have had an ideal place in the prequels, as a Jedi with tactical knowledge of war would have surely been well used by the Jedi. But, as it stands, he's mostly remembered as the background character who looked like a reject from Coneheads.