Who are some prevalent UFC/MMA fighters that spar with an actual Karate stance, not just a little bit. Only one I can think of is Stephen Thompson.
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Guy Mezger did - you can see the bounce and the "rush" that karate points fighters have, he came from a kyokushin background though so not as long a stance as the more shotokan influenced stylists.
Robert Whittaker is another - longer stances the Guy Mezger and you can see that blitz/rush style a bit.
Machida's the obvious one, he's also the main shotokan stylist who competed, the others tend to come from other styles.
Kyoji Horiguchi is a less well known one - 3 years in the UFC, now a bellator fighter, also a shotokan stylist.
Gunnar Nelson's another Goju guy, with a noticeable karate influence in his stances. I think it's his main striking background combined with BJJ.
If you look at Japanese fighters, especially at the lighter weights, there's an unsurprising number of karate guys.