This is Drogon. He isn't the nicest dragon around.
of reincarnation and rejuvenated, yet destructive souls. HBO's Game of Thrones, being literally in a
different world, deals with extremely similar tropes, particularly in the line of House Targaryen that
now lies in the hands of a young Daenerys Targaryen.
As she has stated many times. Dany has her dragons. Each of these three dragons are reincarnations of people in Daenerys' life that have had their spirits infused with the soul and fire of a dragon. The three people who died had extremely close connections to her, them being her husband and her two brothers. Her brother Rhaegar is now the dragon Rhaegal, her brother Viserys is now the dragon Viserion, and her moon and stars of a husband, Drogo, is now the fiercest dragon of them all, Drogon. The dragons personalities represent each of these people, Drogon being fiery, Rhaegal being stoic, and Viserys being lazy.
According to here, "If a dragon is not claimed by a rider when its young, it becomes extremely difficult to bond with as an adult." Sounds like a certain Beloved. She is killed when she is young. She never gets the chance to bond with her mother. She is vengeful, fiery spirit who scares the hell out of anyone in her mother's domain, whether it be Paul D or Here Boy. She constantly draws the awe and attention of anyone around her. She is a spirit of the past transfixed into the present with a considerate power over people that allows her to manipulate them in order to get what she wants, whether it means having sex with Paul D or conniving the literal life force out of Sethe.
They both are quite literally ghosts of their pasts. Dragons went extinct thousands of years back in the Targaryen Civil War known as the "Dance of Dragons". Now Drogon is alive, a haunting presence, and committer of infanticide, referenced in this article; "The winged shadow...Came from the sky...My girl...My little girl." (In hindsight thats a huge coincidence that it was a little girl that was killed), which further proves how this reincarnated monster has a mindset that revolves around fury and destruction; a vengeful spirit of sorts. Beloved, being killed from an act of infanticide, is also quite vengeful and manipulative.
Sethe can't help but baby her to the point of Beloved's leeching of life from Sethe herself. Khal Drogo being smothered by Dany reflects this to the point where their stories are now parallel. Dany proclaims herself as the Mother of Dragons, proudly displaying them and flaunting her familial line. Sethe realizes her true attachment to Beloved, and devotes her full being to taking care of her deceased daughter.
How does all of this tie together? Both Morrison and the show runners of Game of Thrones used these deaths as ways to characterize and prove a character's weaknesses, albeit for completely different reasons. They use ghosts to ground these characters to the past and make the past help guide their future, whether that future being them ruling the Iron Throne and taking over Westeros, or being free of a guilt ridden past that continues to haunt a person to this day. Sometimes their characterization of the past doesn't even help the main character themselves; it helps drive other to characters discover themselves and strive to be better people (Denver), or drives other characters to strive to cover their own pasts further (Ser Jorah Mormont). In the end, Beloved is in fact Drogon, and Drogon is a fiery being who don't need no Mother of Dragons telling him what to do.