Hi, Neil! May I ask, do you have any emotional attachment towards your own characters? I don't mean it like "I can't kill this character because I like them too much", more like you still are easily able to do what your storytelling needs, but you enjoy your own characters, think about them sometimes and just like them. I've recently heard that it's immature to like your own characters and I was kinda surprised, so that's why I've been wondering.
I love my own characters, even the ones I’m going to have to kill. If it didn’t make me sad that they were going to die, how could I make the reader care?