if you have these birthdays, how do you feel?
I think December 25th would be bad, January 1st very close second. At least when you're little that day is still your own and you can have a little party with all the hungover adults. I'd hate it as a teen/adult though!!
I actually wouldn't mind 29th Feb. You'd just celebrate the 28th or 1st March most years, it feels kind of special in a way. Then have a big bash every 4 years! Plus it's far enough away from Christmas. And you're clearly magic!