No idea, I honestly love all of them and can't decide which is my favorite. That's always been the case though, so many good characters throughout the movies. Even the prequels have some great characters, the movies just didn't do a great job of portraying them, but thankfully we have the Clone Wars show for that.
I do love Kylo Ren though, I might say he's my favorite. Although I didn't care for his synthesized voice,
I'm glad that's gone
.