I'd have to be younger (longer than I want to think about since I rode - though I misspent a great deal of my youth around horses) and a deal more slender (far too curvy these days to pass for a bloke though easily tall enough), Eowyn would be the one - riding, fighting, killing fell beasts, sulking and Faramir.
I have the fair hair and grey eyes at least.
From the Silmarillion, it would be Idril.
These days ... err Entwife?