The Deathly Hallows are among the most powerful objects in the Wizarding World. Legend states Death herself made them, and only a few will be wise and strong enough to use them. When put together, these three items will make their owner the Master of Death.
This idea would sound awfully appealing to the characters from another magical franchise, Game of Thrones. Becoming "Master of Death" would send this lot into a frenzy; however, not all of them would be wise enough to wield these mighty artifacts. Indeed, out of all the characters in GOT, only a select few would be capable of mastering the Hallows.
Cersei Lannister
Cersei is arguably Game of Thrones' true villain. Selfish, short-sighted, and without any boundaries, she is the most dangerous woman in Westeros. There's no line she won't cross, and while she believes herself clever, she often makes glaring mistakes that end up coming back to bite her.
The Hallow that would interest Cersei the most is the Resurrection Stone. She'd use it to bring her three children back to life but would ultimately be horrified when she realized they weren't the same ones she once loved. Even if Cersei did manage to survive the trauma of seeing her kids again and gathered all three Hallows, she'd never fully own them. Cersei feared death above all else, so how could she ever master it?
Petyr "Littlefinger" Baelish
The treacherous and cunning Littlefinger was perhaps the most clever and dangerous man in all of Westeros. He single-handedly engineered the War of the Five Kings, manipulating almost everyone around him with unparalleled skill. Littlefinger's only weaknesses were his need for approval and obsession with the Stark women.
Littlefinger would attempt to gather the Hallows to further increase his standing. He'd care little about the Stone and would acknowledge that the Wand would never obey him because he'd never win it from its previous owner. However, the Cloak would become his best friend, and he'd use it constantly, mostly to stay hidden from all who wanted to kill him.
Sansa Stark
Without a doubt, Sansa was the most ambitious and cunning of the Starks, a skilled politician famous for observing and learning. Sansa significantly evolved throughout Game of Thrones, enduring numerous traumas but remaining steadfast in her will to take back her family's legacy. In the end, she becomes Queen in the North, a feat that would've made both her parents proud.
Sansa is clever enough to master the Hallows. She wouldn't feel the need to bring back any dead family members and would use the Cloak only when necessary. However, Sansa's not a fighter and wouldn't win the Elder Wand in a fair fight. Instead, she'd send Brienne to fight in her place, so the Wand would never truly obey her.
Arya Stark
For all her accomplishments, Arya Stark had no real ambitions. Unlike Sansa, who wanted to rule the North, or Bran, who wanted to rule everything, Arya just wanted revenge. She led a simple life, accompanied only by a horse and her trusty sword, Needle. Arya had only a few precious friends in the show, but she cared for them with her life. Still, the ghosts of her dead family members haunt her, which would lead her to try and reunite the Hallows.
The Elder Wand would obey Arya because she would win it in a fair duel. Arya would also find considerable enjoyment from the Invisibility Cloak, which would become her favorite of the three Hallows. However, Arya would use the Stone to revive her parents, inadvertently bringing Lady Stoneheart into the picture. The guilt and trauma of seeing her mother in such a state would probably be too much, and Arya would end up denouncing the Hallows.
Daenerys Targaryen
For years, the Mother of Dragons was the ultimate hero, the breaker of chains and unburned, who always rode her dragon to victory. However, she ended the show as a tyrant, a merciless conqueror who burned millions alive. The signs that Daenerys was Game of Thrones' real villain all along were always there, even if the show executed her descent into madness very poorly.
Daenerys' ambition would compel her to unite the Hallows. She and Drogon would burn the Elder Wand's previous owner; after that, locating the other two Hallows would be a piece of cake. However, Daenerys' unpredictability and the might of the Wand would push her over the edge, leading her to try to take over the entire world. And much like her ancestors before her, she'd find out that a conqueror's path often ends in tragedy.
Melisandre
Melisandre was the most faithful servant in the faith of R'Hllor, one of the most popular religions in Game of Thrones. Her commitment was borderline fanatical, leading her to commit some of the most shocking acts in the show's history, mainly burning Princess Shireen on the stake.
As one of the most powerful magic-users in Westeros, Melisandre has enough power to reunite the three Hallows. She'd mainly use the Wand to spread the Lord of Light's word around the Seven Kingdoms but would quickly fall under its corruption. Melisandre would also use the Cloak for protection and might even attempt to bring Shireen back with the Stone because she eventually grew very regretful over her actions.
Tywin Lannister
As admirable as he was despicable, Tywin Lannister was arguably the show's best villain. He was clever, ruthless, and always one step ahead of his enemies. His indomitable will was legendary, only matched by his irrational hatred for his youngest son, Tyrion.
Tywin would launch a thousand campaigns to reunite the Hallows. He'd use the Stone to revive his beloved wife, Joanna, and the Wand to cement his place as the most powerful man in Westeros. The Cloak would serve a less apparent purpose, but he'd still find a use for it. Tywin has everything to become the true Master of Death; indeed, the only thing that stands in his way to greatness is himself.
Tyrion Lannister
The sharpest of the Lannister children, Tyrion, was also one of Game of Thrones' best characters. He was clever and witty, providing many of the show's most unforgettable moments. Even if his intelligence did seem to diminish in later seasons, Tyrion remained one of the show's most compelling characters.
After much time reading and searching, the youngest Lannister would find the three Hallows. He'd even find a way to trick the Elder Wand's previous owner, using his gifted mind rather than brute force. Best of all, Tyrion wouldn't brag about having all three Hallows; instead, he'd use them wisely, preferring to enjoy them by himself rather than achieving notoriety through them.
Jon Snow
Ever the honorable fool, Jon Snow faced death multiple times throughout the show. He even died once, only returning to life thanks to Melisandre's Red magic. Jon was kind and honest, a knight in every sense of the word. Above all, he was sick of battle and longed for a peaceful life away from the fight.
Unlike almost any other character in Thrones, Jon would never seek the Hallows voluntarily, realizing they're too powerful for any one person to hold. However, if tasked to find them, he would. Like Harry, Jon would destroy the Elder Wand and get rid of the Resurrection Stone. He would keep the Cloak, though, using it to spend some much-needed quiet time alone.
Bran Stark
Tyrion claims that no one has a better story than Bran the Broken, and he might be onto something. After all, Bran was only a child when he journeyed beyond the Wall and learned the secrets of a long-forgotten past from a long-forgotten tree-man. Bran is also one of the few magical characters in the show, meaning he has a considerable edge over all others.
Because he knows everything, Bran would have zero trouble locating the Hallows. He'd also have no problem in gathering them; he could even warg into a wolf and kill the Elder Wand's previous owner. Bran doesn't "want" anything so Death would recognize him as the Hallows' true Master. In the end, Bran would also welcome Death with open arms, ready to part from this life as equals.