Guess I'm the "odd guy out".
I'm normally a cold sleeper. What's interesting is that most of the original categories in the opening post on this thread don't pertain to me.
When I was younger, I had a high metabolism, very low body fat, and only weighed about 135lbs. Very fit and athletic (military). Genetics are Native American and Irish. Always been an outdoors person. And I've always slept cold.
I've gotten older, less fit, a little heavier, but all the rest remains the same. And I still tend to bundle up when I sleep...although I love a good cold breeze on my face when I'm wrapped up toasty and warm.
Not sure what the key factor is in what makes me a guy who's a cold sleeper compared to most others.