little funny scénario with yandere hashirama/tobirama and madara(separated scene):
Imagine if modern reader make them watch game of throne
Hashirama;yes ! I like the character of ned !
After hashi watch season 1
Hashirama:Why is the series cruel..
Y/n:And this is just the beginning...
(I think of all the death of the good character of game of throne will make him sad and that make y/n comfort him)
I think he would watch it and will instead judge the characters according to their decisions
Tobirama:If he hadn't made that stupid decision, he wouldn't be in this situation.
(No need to guess that the character he hates is Littlefinger and Joffrey but i think he will like tyrion lannister)
When there a bloody/violent scene
Y/n:you don't want that i skip ?
(I think he will love the character arya stark (and love arya revenge scene for the red wedding)
Now, I think Hashirama wouldn't necessarily be surprised by the cruelty of Game of Thrones. You do have to remember that he grew up in an era of war, has been fighting since he was a child and has lost a lot of siblings and brothers to the lasting conflict. I think he won't be turned off simply because everything that happens within the series from betrayal to political schemes is something he is still living and experiencing today even as a Hokage. Also, I would have to disagree with the statement that every character's death would make him sad. I have a hard time seeing him mourning after people like Ramsey because Hashirama probably has met people like this and killed them himself.
Tobirama would arguably be most intrigued by all the schemes and the intrigues going on in every episode. I can see him taking a liking towards characters who play it smart so people like Tyrion and Varys would be the ones he looks forward to the most. He himself is a person who is always thinking and scheming and I do actually think even between him and Little Finger there are certain similar traits. Because the narrative tends to portray Little Finger as the villain though, he may not like if his darling points out that both of them are similar. He'd hate the ending too, you cannot convince me otherwise. Starting from season 7 or earlier he'd probably begin to point out all the plotholes how the decisions characters make within the show have stopped making sense.
The Uchiha Clan is known for their very intense loyalty and their strong feelings which tend to have them go insane if they lose a lost one and in that aspect Arya may just be an honorary Uchiha in another dimension. After all she dedicates her entire life to avenge the murder of her oldest brother, his wife and her mother so that alone would probably leave the biggest impression on him as she is a fighter and very loyal to her family. However, he too is the leader of a clan and so he too is going to be interested in the political schemes. Also, considering that the Uchiha's element is fire and he is one of the best users of the Fire Release, he may just judge the literal fire-spitting dragons by claiming he can do way more damage with his Katon.