Queen Daenerys Targaryen is a major character in Game of Thrones. She is played by starring cast member Emilia Clarke, recently voted the Sexiest Woman Alive: http://www.esquire.com/entertainment/interviews/a38719/emilia-clarke-swa-2015/
Daenerys is the younger sister of Viserys Targaryen and the youngest child of King Aerys II Targaryen, who was ousted from the Iron Throne during Robert's Rebellion. Her brother Viserys often called her "Dany" for short, and she is also frequently referred to as Khaleesi. On the night Daenerys was born on Dragonstone, a vast storm raged. For this reason, she is sometimes called "Daenerys Stormborn".
Of course, all this is pretty irrelevant. We all know why Daenerys is awesome. She is the Mother of Dragons. At the end of Season 1 she steps into a raging fire with three dragon eggs. The next day - when the fire has subsided - Daenerys lies naked in the middle of the fire pit with three newly-hatched dragons clinging to her body, the first three dragons in the world in a century and a half. Ser Jorah and the remaining Dothraki fall to their knees, proclaiming Daenerys their queen and leader:
"You have a good claim: a title, a birthright. But you have something more than that: you may cover it up and deny it, but you have a gentle heart. You would be not only respected and feared, you would be loved. Someone who can rule and should rule. Centuries come and go without a person like that coming into the world. There are times that I look at you, and I still can't believe you're real." ―Ser Jorah Mormont to Daenerys Targaryen
Unsurprisingly, Daenerys has only gotten more and more powerful since she birthed the three dragons. She now rules several kingdoms, has an army of Unsullied warriors that she commands, and has her eyes set on conquering Westeros. Her worst decision was chaining up the dragons at some point, but she quickly figured out that was a mistake. We left her at the end of last season on top of a hill with Drogon, surrounded by a Dothraki khalasar. Can't wait to see what this season holds. And it all starts again tonight! Let's do this...