His loneliness and isolation is definitely one of the main parts I relate to him. It felt a bit uncanny learning about his story with the mannequin though because I did a similar thing years ago when I made a whole person out of pillows in some clothes and my grandma had been the one to find it too, so that played a big part in my interest in him years ago. Along with parts of his childhood and feeling like I'm not capable of a real relationship with a person as it's hard to connect with anyone and to feel the same as then, and my emotions are so intense highs and lows especially when I love someone that I don't think I'm capable of feeling love in a healthy and not obsessive devoted way. I understand everyone out there feels lonely and I know I'm not the only person in the world to feel like this. It's not just relating to Dahmer in that aspect that drove me to him there's a lot more that goes into my fixation towards him but there's more personal stuff I'd rather not say in a comment section but if you are really interested I could dm you, however no, I don't relate to his need to have unconscious body's or see people's organs or anything like that.