I think he’d be more interesting as a straight villain. Something along the lines of Krennic or Tarkin. Someone who is just an evil criminal, not driven by the baggage of granddad and mom.
A bit premature don’t you think? Snoke could have twisted Ben in a multitude of other ways while seducing him. Kylo feels as though he should rule over non Force Sensitives which means at least part of his motivation is based on his philosophy. Who knows how many other bits of philosophy have had an influence on his actions?
As it pertains to Leia we don’t know how Kylo feels about her. We can infer but we have nothing concrete.
EDIT:
In defense of my earlier criticism of Kylo, the depth is all Rey.
I disagree as Kylo taking off his mask is out of character as he didn’t do it for Lor San Tekka or Poe. The only two people he did this for were his father and this scavenger. Why would he do such a thing for a seemingly insignificant figure?