I like my own hair blonde since that's my natural colour and fits my ghost pale face very well, but on other girls I think red hair is pretty rocking, natural or not. And for guys I usually prefer darker shades, brown and black. Sure there are cute blonde guys as well, but they rarely have brown eyes to match.
Blonde. I just love blonde hair, it's so pretty But I like platinum/white even more, though that's not a "real" colour I guess
I also like brown as far as neutral hair colours go. Preferably a light or ashy-brown colour and not a saturated reddish-brown. It looks really good on my beloved "messy" hairstyles. To be honest I'm not fond of black or red hair and can't really imagine my dream partner with either
Very, very light/pale blond hair; it can almost appear whitish/silver. It almost exclusively appears on children, except for people who dye it that color (which IMO is just plain ugly if it's not natural).
I actually envy children when they have that really light blonde hair. Kinda sucks for them that it never stays like that with age. I'd be disappointed to find out I had had like that when I was a kid and didn't care and not anymore now when I do