I love and hate Fantasy writing, on the one hand you get to 'change' things - i.e. being gay is 'whatever' in this world, for the most part, on the other hand, you have to develop and stick to the underpinnings of the world. Fun, but tedious and tough sometimes.
Answers: Stefren is the King's nephew and not in line for succession; Many other kingdoms; Fenzu is akin to Sensei - he is the head master of the Dojo where the fighters train; Dlgen are touched by the Twins (Gods) and are called to be above petty interkingdom spats. They are long lived, and very strong, fast, proficient. There is a lot more but unless and until I write it, I'm not going to give it away yet.
Last - Harlin I think you have right, but add in broken still, Stefren is not inexperienced, more like unhappy with the loveless life he's had so far. His family is more interested in court intrigue than him as a person. Telg/Fenzu is not insensitive, but he is stern, for good reason, but that is a plot line to be developed in time.
Oh well, back to whatever