Can't shake the feeling that this has to do with
Game of Thrones
Spoilers ahead (not just the puzzle kind):
Who am I?
Though some may find me lacking,
others call me less
Lacking and less referring to her arguable unfitness to rule to some in the show, between being a female (less than a man) and not having the right to rule (lacking).
some may think i’m both,
despite my flame and my finesse
Flame is an obvious reference to her title and dragons.
Family, no family, mind's asunder
Feel the elements, hear the thunder
Her family lineage is what she feels gives her the right to the throne. However she also believes herself to be the last of her family; and instead refers to her dragons as children. Targaryen's are known for going crazy, and she may be showing symptoms herself. The elements and thunder can refer to the fire and roar of her dragons as well as a reference to her title as Daenerys Stormborn.
They will rue the day, I have a plan
I will find and kill ___ _________
She certainly has a plan, to take the iron throne and kill a few people along the way, but not sure what exactly goes in the blanks (Cersei Lan? lol)
And tales are told across the land,
but folly of man is left to stand
This is the shakiest part for me, can't really make a direct connection except perhaps Daenerys' frustration that Cersei (or Lannisters in general) are still in power of the throne despite stories of illegitimacy, the cruel acts committed, and that ultimately she feels her family was robbed of the throne in the first place.
and though I sympathize no more,
you know nothing, wait for the door
Hard not to see the GoT references here, though admittedly Daenerys herself is not wise to either 'You know nothing' or 'Hold the door', it still makes sense as general references to the series.
Feel free to help me fill in the gaps. Also (as some may notice) this is my first time posting here in a looong time, so forgive my formatting.