The RPlague

[Lalaith]

Other orphans - Huor, and Elwing...
oh and it wasn't just Haleth but many of the Haladin women who fought. And as for elven shieldmaidens, they're not entirely out of the question:

Indeed in dire straits or desperate defence, the _nissi_ fought valiantly, and there was less difference in strength and speed between elven-men and elven-women that had not borne child than is seen among mortals

Having said that, I don't know anything about RPG so I'll bow out now.