Raam Sho'am
Gaidin
There's an unofficial Word of Brandon out there that Nightblood is significantly more powerful than Shardblades. He was also asked about how they'd interact at an official Q&A and RAFOed the question.
Vasher is in Words of Radiance as well, under a different name. Spoiler tag just in case:Zahel the grumpy ardent is Vasher.
Kate Reading's voice gets really cute at 2x speed.