I was thinking him too. But like he said, the last line throws people off. So,I don't think it's him. I will not stop, however. Anyway, I'll be sure would-be-king isn't actually king. Therefore, I have a solid guess. It might not fit too well, but I will still guess it.
Morgoth himself (that's where would-be-king fits in) said...
"My hatred will forever be upon them, and my hand will follow them and lead them to bitter death... they'll die without hope, cursing both life and death.
But, as if to spite him, my namesake died before his 'hand' could reach her. Therefore, she is renowned for escaping Morgoth's power... the star hint could refer to this.
Then, after her merciful death, her papa tried to make a lament for her. On a HARP.
Lastly, Morgoth is the would-be-king...
A bit far-fetched, but we learn from mistakes, don't we?
My guess remains Urwen. (Also known as Lalaith)