Both the Clone Troopers and their Stormtrooper successors in the Galactic Empire went down in Star Wars history as faceless cannon fodder to be killed by either the droids or eventually the Jedi. Initially, the decision to make the Stormtroopers seem robotic or less human was to paint the good guys in a better moral shade; they're practically killing inconsequential goons.
However, the most recent developments in canon Star Wars lore have introduced some lovely touches of humanization for the once inhuman characters. That included the Stormtroopers. Quite a handful of them have become disillusioned with either the Empire or the Empire-wannabe, the First Order, and have thus taken off their helmets.
This symbolic act thus gave them more character and they have transcended from mere bucketheads with bad aim. These following "defectors" and "traitors" might not be Force-sensitive (though one of them is), but they sure know how to make a disturbance in the Force.
7 Finn/FN-2187
Finn was the first among a sea of black and white to reject the inhumanity that was thrust upon the idea of a Stormtrooper. He achieved this defiance even before the release of The Force Awakens, specifically in the trailer. He was one of the TK Trooper batches (non-clone Stormtroopers) who were trained from childhood to serve the Empire and eventually the First Order.
What served as Finn's disillusionment was his friend's death (though it was Poe Dameron who killed his friend). In any case, Finn is the most special Stormtrooper defector since he's not a clone and there's also the fact that he was Force-sensitive, as was revealed in The Rise of Skywalker.
6 Hunter
Hunter, whose serial number is kept a close-guarded secret to this day, was originally a member of Clone Force 99. They're a generation of clones who were created with defects but had desirable mutations such as personality deviations and more nuanced physical traits compared to their brothers.
In Hunter's case, he was tactically smarter and wiser than the other clones, automatically making him a leader of the "Bad Batch." They're a small squad of clones from Clone Force 99 who mostly weren't affected by the Order 66 inhibitor chips. Thus, they were able to work undercover within the Stormtrooper ranks until their secret became too big to hide and they had to defect.
5 Tech
Tech was also part of Hunter's Bad Batch squad. He also was unaffected by the Order 66 chip. Tech's mutation consisted of a calmer temperament, meaning he generally avoids conflict and confrontations. He's also logically and technologically smarter compared to the other clones, making him the "genius" of the squad, specializing in equipment and technical work.
He's also an expert slicer or hacker in the Star Wars mythos and has a plethora of other intelligence-intensive skills that allow him to be the brains of the squad. Also due to his mutation, he looks somewhat different and gaunter than the usual Jango Fett template clone. Still, he came from Jango's mold and shares the same DNA as the other clones.
4 Wrecker
Wrecker, based on his name, is the muscle of the Bad Batch squad. He was born taller and larger compared to the other clones, and he also had the musculature to back up his frame. Thus, Wrecker gets generally placed on the frontlines, often enacting Tech or Hunter's plans or orders. Although, his brash personality has proven to be quite troublesome at times.
Wrecker often has a personality conflict with squadmates like Tech. Still, he remains a loyal comrade to his squadmates and has perfect synergy with them despite his preference for conflict and strength. He also looks like a standard Jango Fett clone save for the bigger stature and the eye wound.
3 Echo/CT-1409
Echo somehow became Crosshair's replacement in the defector phase of the Bad Batch after they left the Imperial Army. However, Echo wasn't part of the original Clone Force 99. Instead, he was a regular Clone Trooper who went on to continue his transition as a Stormtrooper under the Imperial Army until he quickly became disillusioned.
He deserted shortly after refusing to execute civilians on behalf of the Empire. It's also worth noting that Echo didn't have his behavioral chip since he was turned into a cyborg during the Clone Wars, purging him of the Empire's primary means of control for the clones.
While he doesn't have the same advantageous mutations as the Bad Batch, he still proved synergistic to the squad since his cybernetics allowed him to perform droid-like reconnaissance.
2 Gregor/Captain CC-5576-39
Gregor was among the one thousand Republic Commandos during the Clone Wars who were integrated into the Galactic Empire's Imperial Army as training officers for TK Stormtroopers (non-clones). Like other intelligent Jango Fett clones, he eventually became disillusioned with the Galactic Empire's ideals and tyranny.
He not only took off his mask but also defected, though he was caught shortly after this defection. Hence, Gregor's freedom became the first mission of the Bad Batch after they too defected from the Stormtroopers. Sure enough, he looks like a regular Jango Fett clone except older due to genetic degradation.
1 Crosshair/CT-9904
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Crosshair is an even more troublesome member of the Bad Batch since he has a colder personality, which he likely inherited from his Mandalorian trainer back in their boot camp days in Kamino with Jango Fett. He has little regard for the lives of other clones outside the Bad Batch despite technically being brothers with them.
He was gifted with keener eyesight compared to other clones and thus became the sniper and the lookout for his squad during the Clone Wars era. However, during the rise of the Galactic Empire, Crosshair was the only one affected by the Order 66 chip and carried out the Emperor's orders. This led to his batchmates abandoning him when they defected to the Rebels.
Hence, Crosshair remained with the Galactic Empire and was even made a Stormtrooper commander for the clone division with his own Elite Squad. This makes him one of the few (or perhaps the only) Stormtroopers who took off his mask and remained loyal to the Galactic Empire.