Jedi who can use the dark side?

Which Jedi in Legends and canon have been able to successfully tap into the dark side of the force without completely succumbing to it and becoming sith?

Luke and Rey.

-Mace Windu with Vaapad I’d say
-Canon Vos was kinda ambiguous. He fell to the dark side when he was dooku’s prisoner, but then he also said he wanted to defeat the count and leave the order after that. He wasn’t completely evil.
-Ezra maybe?

Vos fully became a Sith agent didnt he? Asajj was just able to bring him back to the light after he fell

Legends: Kyle Katarn is the prime example. Others include Jaden Korr, Mara Jade, Galen Marek, and Luke Skywalker. Man, I haven't thought about this in a while, there's probably tons of examples. Maybe even Xendor?

Canon: Rey, certainly. Kylo even felt the pull of the Light after he turned. Cere from the Fallen Order video game. Ahsoka, maybe? Even Dooku for the couple of decades before he went full-on sith. There's not too many Jedi in Canon, yet, so it's hard to say. I'm sure the High Republic stuff will change that.

Ezra also.

Could unlock the Sith holocron, without showing any flagrant affinity to the dark side.

Originally posted by Sheev
Vos fully became a Sith agent didnt he? Asajj was just able to bring him back to the light after he fell

Originally posted by Galan007
Ezra also.

Could unlock the Sith holocron, without showing any flagrant affinity to the dark side.

Looking back on that, I'm not sure I like it...especially when that whole dark side angle with him went nowhere.

The Ezra/dark side plot went absolutely nowhere.

In the end, all we know is that he was capable of activating/studying the Sith holocron without ever really being drawn to the dark side... Which is quite something in hindsight.