Arguably, some of the rarest types of Jedi were the so-called Iron Knights. These are members of the Shards species - crystals with a brain of their own. They were Force-sensitive and all trained under the tutelage of Jedi Master Aqinos. The Shards had droid bodies, similar to that of General Grievous.
But one Jedi stands above the rest and needs to start getting recognized as the greatest Jedi who ever lived. That is none other than Obi-Wan Kenobi. While this saga is ultimately the story of the Skywalkers, Obi-Wan is arguably the best and most pure Jedi to ever come out of it.
In the Star Wars Legends continuity, the founders of the Jedi Order were Jedi Masters Cala Brin, Garon Jard, Rajivari, and Ters Sendon.
Jedi Master Yoda is the most powerful of them all. This should come as no surprise, as he was the head of the Jedi Order in the prequels and was revered for his abilities during the original trilogy.
Cerean (Ki-A-Mundi) At face value, Cereans do kind of just look like coneheads. But in their big brains of theirs, they actually have a special connection to the Force and create more Jedi than many other races.
As a Sith, Praven was very strong in the dark side of the Force, though he felt stronger with the light side as a Jedi. He wielded a single red-bladed lightsaber as both a Sith and a Jedi, and he was skilled in the use of a wide variety of Force powers, including Force lightning, Force blasts, and Force paralysis.
The legendary Obi-Wan Kenobi is considered one of the strongest Jedi ever to carry a lightsaber. He took down Darth Maul twice, defeated the infamous General Grievous in one-on-one combat, and bested his former apprentice Anakin Skywalker in the fateful duel on Mustafar.
With the death of T'ra Saa at Taivas, K'Kruhk became the oldest and most experienced of the surviving Jedi and participated in the alliance's final assault on the Sith-held Coruscant. Following the deaths of Darth Krayt and Roan Fel, K'Kruhk became one of the three Triumvirs of the restored Galactic Alliance.
Vernestra was enough of a prodigy that she eventually attained the rank of Jedi Knight at the age of only fifteen, making her the youngest Knight in a generation.
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Vern is a newly-minted Jedi Knight. Vernestra, Mirialan, was Padawan to Stellan Gios. She works hard and is devoted to the Jedi Order, more so than most others her age. At sixteen she is one of the youngest Knights in a generation.
During the High Republic, the 12 seats on the Council consist of three Grand Masters, including Yoda, Lahru, and Pra-tre Veter.
Truly, the most powerful Sith Lord was Darth Sidious, better known in his public persona of Chancellor (later Emperor) Palpatine. Through cunning and manipulation, Sidious killed his master to claim the mantle of Dark Lord of the Sith.
Yoda. Master Yoda, the wisest and perhaps most powerful Jedi of them all, remains species indeterminate and looks like something the cat might drag in, but his lustre as the lovable font of all Jedi wisdom is undimmable. He's lived 900 years.
Mace Windu: 155. Tarkin: 150 - 155. Qui-Gon Jinn: 150 - 155.
5. Darth Plagueis. Darth Plagueis was the wisest of all the Sith lords. His knowledge of midi-chlorians gave him the power to create life where he saw fit.
Chirrut was a character who was blind, but he was guided by the ways of the Force, which allowed him to trust his instincts and even measure up to some of the best Jedi.
The Jedi Padawan Jolee Bindo fought for the Galactic Republic in the Great Sith War against the Sith Lord Exar Kun, who sought to establish a new Golden Age of the Sith. After the war ended in 3996 BBY, Bindo abandoned the Jedi Order and became a Gray Jedi.
Piell became a Jedi General and participated in a myriad of battles during the three-year conflict, often being assigned vital missions to safeguard vital Republic territory and information.
As the first Dark Lord of the Sith, Ajunta Pall founded the first Sith Empire and expanded it onto other worlds. The Sith took over the planet Ziost and created it as their capital and as Pall's new home.
In the Sith Empire, as time progressed pure-blooded Sith were steadily bred out, resulting in only a few pure-blooded Sith left in the Sith Empire by the time of the Great Hyperspace War (5000 BBY). By 44 ABY, the true Sith species in the Empire were believed to have gone extinct due to the interbreeding process.