Recently, I’ve gotten back into researching what MBTI (Myers-Briggs Type Indicator) personality type each of my main characters might be.  I highly recommend this as it gives you a framework to understand your character a little better.  A few characters have been mis-typed over the years, true, but that’s the beauty of writing: you get to explore and experiment.  So, if you’re stuck with a character or need to delve into their psyche, I suggest you go to somewhere like and give answers that your character would give.  After that, poke around the internet (Pinterest has been my favourite place) and see what other people think about the types, and how the types interact with each other. You might just be surprised by something.  I know I have been.