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Is there any evidence of a force user using a kyber crystal that is wrong for them in their lightsaber and this having an effect on their ability to use it? How does it impact them?

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Not in any significant way. In fact, it's just the opposite. In current canon, the crystal is affected by the user.

In the novel Ahsoka, she takes the kyber crystals from an Inquisitor's lightsaber and puts them in her hilts. They then changed color in response to her attunement.

Before she could even consider shouting a warning, the red lightsaber burst into a mess of noise and light. Bright spots pricked at her eyes, and then all was quiet. The creature wasn’t going to bother her anymore.

[...]

Kneeling beside her fallen foe, Ahsoka sifted through the wreckage of his lightsaber hilt. The crystals that had powered his lightsaber were no longer contained by metal, but their song had not dimmed. She held them in one hand, almost shaking as the familiarity of them coursed through her, while the other hand retrieved the half-finished hilts she carried with her.

[...]

Her mind’s eye sorted the preassembled components and those she had just retrieved into order, locking each into place with the others. When Ahsoka opened her hands, she was not surprised to find that two lightsabers, rough and unfinished, were waiting.

They would need more work, but they were hers.

When she turned them on, they shone the brightest white.
Ahsoka - Chapter 28

The novel hints at the crystals being Ahsoka's which shows that even though they were wrong for the Inquisitor, it did not have a noticeable effect. And once Ahsoka got them, she was able to "reattune" them.

The Star Wars Databank says:

A lightsaber crystal is colorless until first attuned and connected to a Jedi -- at which times it glows either blue or green or, in some rare instances, another shade. From that point on, it retains that hue.
Kyber Crystal | Star Wars Databank

So all evidence points to the crystal being the only one affected. Now, since in current canon a crystal is attuned with the Force and an extension of a Force-sensitive's awareness, it is likely that using a crystal that is not yours (or using someone else's lightsaber) has some disadvantages. But this would be much like using any weapon that was not the one you were used to using.

In summary: The crystal will work and there will be little to no effect

  • In addition to this red lightsabers are "hurt" crystals ("mentally broken") as shown in the canon vader comics. – Thomas Mar 14 '18 at 20:52
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If the crystal is not attuned to user, he could not use it to full effect

First example is from comic Darth Vader: Dark Lord of the Sith part 1. I could not copy all relevant pages here, but basically Palpatine tells Vader that his old blue saber is no longer good enough for him because it was Jedi weapon. Instead he needs to bleed Kyber crystal and build new one . It is implied that he lost his fight vs Kenobi because he was no longer attuned to the weapon.

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Second example could be Luke Skywalker. He firstly used that same blue lightsaber (belonging to Anakin) but he was not very proficient with it, losing fight and hand vs Vader. Later, he constructed his own lightsaber (green) with much better results (beating both Vader and Jabba's henchmen)

  • A Jedi would construct their own blade after having first learned to use a standard blade. This would give them the knowledge needed to determine what unique features (more powerful emitter, shorter blade, lighter hilt, curved hilt, etc) would best suit their fighting style. I can't remember anything specific mentioned about the kyber affecting the finished product. – Valorum Mar 14 '18 at 21:10
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    I'm pretty sure he lost his fight with Kenobi because he didn't have the high ground ;) – Mwr247 Mar 14 '18 at 21:14
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    @Mwr247 Young fool, only now at the end do you understand ... red is high, and blue is low :P – rs.29 Mar 15 '18 at 6:27
  • @Valorum In new canon Jedi younglings would go to Ilum to select specific crystal for their lightsaber. Only after that they would become Padawans. This is in S05E06 of Clone Wars. – rs.29 Mar 15 '18 at 6:30
  • @rs.29 - Indeed, but I'm struggling to recall what's said about the crystal. They definitely need one but the rest of it (the whole choosing process) seems to just be part of a shared mystique rather than the crystal having any specific impact on the efficacy of the lightsaber. – Valorum Mar 15 '18 at 7:14

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