Let's get obscure! As EvanNova95 once told you the story of Halagad Ventor...I shall tell you the story of the first Jedi Knight Darth Sidious ever encountered...the Jedi Master: Ronhar Kim.
The 5th - missing - entry from my "Top 4 Underrated" list of Jedi video, Ronhar Kim had a great short complex story that explained several larger elements within the timeline. I'm not arguing that he's a fantastic personality or incredibly powerful. But he should be remembered...as should the authors who worked their magic through him and his story.
For more Underrated Jedi check here: https://www.youtube.com/watch?v=Mx2D9RlriQM