They who sit on the Iron Throne in Game Of Thrones are the King or Queen of the Seven Kingdoms, yet they are not the only monarch in Westeros. From Kings/Queens in the North to Beggar Kings to Kings who have no real claim, the show is full of Kings and Queens, and these people tend to run the gamut from genuine kindness to downright malevolence.
There are a handful of Kings and Queens who, despite their flaws, are not bad people. However, many of the evilest characters throughout the show sit on one throne or another and are utterly abhorrent while doing so.
Sansa Stark
While Sansa wasn't always very likable at many points throughout Game Of Thrones, she really grew out of her childish brattiness and became a leader who was clearly looking out for the best interests of the people that she led.
Her reign didn't start until the greatest crises of Westeros were over, so the likelihood that she'd be personally responsible for any heinous acts in the future seems very low too.
Jon Snow
Jon Snow spent a very brief time as King in the North and he is arguably one of the most consistently benevolent people in all of Westeros.
While the character has his flaws, he is a hero who fights endlessly to protect others against real evil for eight seasons. His only real misstep (although to be fair, it was a pretty big one) was bringing his people south to fight for Daenerys, as many of them were killed for an unjust cause and wound up fighting on the wrong side of the massacre of King's Landing.
Robb Stark
It is hard not to feel bad for Robb Stark, the oldest of the Stark children thrust into a war, dying because he put matters of the heart above his duty as the King in the North.
Robb was one of the bravest Kings, Starks, and overall characters in Westeros for his time in the show, and far from terrible - despite the fatal mistakes that cost him and others their lives.
Bran Stark
One of the worst and most vilified aspects of the finale was Bran 'the Broken' Stark becoming King of the now Six Kingdoms - something that many fans would change about Game of Thrones if they could.
When he became the Three-Eyed Raven, Bran became very unlikable and often boring. He may not have been malevolent himself - he seemingly transcended morality - but the character was not loved by fans, nor was his role in season 8.
Tommen Baratheon
Of all the Baratheons/Lannisters in Game Of Thrones, Tommen is the least evil by quite a margin and deserved better than his tragic death.
Tommen may have inherited Joffrey's crown but did not share his cruel, loathsome temperament; Tommen was kinder. He was too young to be King and could perhaps only be considered 'worse' than the Starks by sheer association with the other irredeemable Lannisters.
Mance Rayder
Mance Rayder, the King beyond the wall, may have been considered evil by many within the Seven Kingdoms, but in reality, he was a man fighting for his people.
Of course, he does some questionable things to get south to save his people from the White Walkers, but it is hard to blame him. He does worse things than the Starks, out of necessity, but is nowhere near as wicked as other monarchs, and he can at the very least claim that he was truly doing what he thought was in the best interest of those that followed him.
Renly Baratheon
Out of every one of the Baratheon brothers, Renly is the nicest and may very well be the most equipped to be king (which isn't saying much).
But, in his claim to the Iron Throne as one of the Five Kings, Renly believes himself a hero and puts many lives at risk, lives for which he cares very little. Perhaps not completely immoral, but not all that good either, and the fact that he would willingly let people die for his narcissism does not speak highly of him.
Robert Baratheon
Was Robert Baratheon an evil King? No, not really. But was he a good King? No. Baratheon took the Iron Throne almost out of necessity and was not fit to rule over the Seven Kingdoms, primarily because of his self-serving nature and disinterest in the position.
His abuse towards his wife, neglect of his duties, and his willingness to kill a child for his political security are all monstrous things, so he is not a good man, but not an evil one either.
Balon Greyjoy
Another man who fought in the War of the Five Kings, for some reason, is Balon Greyjoy, not the evilest of Kings, but perhaps the most pathetic.
Balon spends most of his life in Game Of Thrones enamored by his own obsessions. Despite these ambitions, he is shown to be moronic. Not only is he a bad father, but he is also a wholly bad person, however it is almost as though he does not have the skill or brains to be truly evil like the show's best villains.
Euron Greyjoy
In the show, Euron Greyjoy is like a cartoon character at points. He does get a few great moments to be this violent Viking-like pirate, but nowhere near enough, especially in comparison to his novel counterpart.
Nevertheless, the King of the Iron Islands manages to show himself as far more brutal than the brother he murders. In the books, he is pure evil, which is not shown well in the series, but the bloodlust and cruelty are still there.