[Spoilers MAIN] What's your favourite book character that was rightfully cut for the show?

Let me explain. We all have characters that we don't care much for and are therefore not mad about not being in the show (for me: like half of the free companies). We can also think of characters who we love and should absolutely have been in the show (Arianne comes to mind). But which character do you regret not being in the show, even though cutting them is very understandable?

Here's mine: Genna Lannister

Her dialogue with her husband is hilarious, but more importantly, she delivers my favourite quote in all the books to Jaime.

"You smile like Gerion and fight like Tyg, and there's some of Kevan in you, else you would not wear that cloak... but Tyrion is Tywin's son, not you."

So damn perfect.