Truth is, I initially disliked/was unimpressed by Kylo Ren, but over time my opinion has changed. He is quite an unusual character in the SW universe. (Not that I'm an expert)
It's very very difficult to type fictional characters. I can see how people jump to INFP at face value for sure. But if you think about Ben the person, perhaps he was ENFJ, and is the shadow self INFP as Kylo. But it's tough to see the particulars, and I would tend to default to an S type maybe.
Interesting, cheers for the insight! I agree that fictional characters are difficult to type, for obvious reasons. With the exception of villains, who are INTJs. I'm joking.