What if a Kuros did not want to be evil? Kuros supposedly take pride in it, but is there such a case where a Kuros did not agree with the majority of its race and even protested it?

Lost Queen : Some did, yes. Those that so viciously fought against us and shamed our people were either put to death, or banished depending on the King and Queen. 

Though… those that were banished for choosing the side of good ran a very, very high risk of death once they pierced the Veil. No longer akin to darkness, as well as the beacon of the Mark, they were like wounded prey for Breithonakt to feast upon. Not all Riaocht’Nol  were devoured by Breithonakt, sometimes he chose to let them go, but those that betrayed their people to fight for all that was good almost never left the Veil again.

Cynder is the only Riaocht’Nol I’ve ever known that’s made it out of the Veil alive.