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"Tell your father I am here, and tell him the Lannisters aren't the only ones who pay their debts."

―Oberyn Martell to Tyrion Lannister

Prince Oberyn Martell, commonly referred to as the Red Viper of Dorne, was a member of House Martell, the ruling family of Dorne, and the younger brother of Doran Martell and the late Elia Martell, and the father of eight bastard girls known as the Sand Snakes. He is well known for his fighting skills, passionate temper, and sexual appetites. 

He was killed by the Mountain. 

"If you think this has a happy ending, you haven't been paying attention.""If you think this has a happy ending, you haven't been paying attention."

―Ramsay to Theon Greyjoy

Lord Ramsay Bolton, formerly known as Ramsay Snow, was the legitimized bastard son of Roose Bolton, Lord of the Dreadfort, and the unidentified wife of a miller.

Queen Yara Greyjoy is an ironborn, Theon Greyjoy's older sister and his only surviving sibling. She was raised at Pyke, the stronghold of House Greyjoy. Yara is a fierce warrior and commands her own longship. She is currently a claimant to the throne of the Kingdom of the Iron Islands and an ally of DaenerysTargaryen.

Yara is captain of her own longship, the Black Wind.

"You want me to have a god? Fine. King Stannis is my god. He raised me up and blessed me with his trust. He gave you a future I could never have imagined. You know how to read, you'll be a knight some day. You think a fire-god commanded all that? It was Stannis, only Stannis."

"A girl is Arya Stark of Winterfell, and I'm going home."

―Arya Stark

Princess Arya Stark is the third child and second daughter of Lord Eddard Stark and his wife, Lady Catelyn Stark. She is later trained as a Faceless Man at the House of Black and White in Braavos.

"The Iron Throne is mine by right. All those that deny that are my foes."

―Stannis Baratheon

Stannis is one of the most accomplished field generals in the Seven Kingdoms. He fought for his brother King Robert during his rebellion against The Mad King. At one point he was besieged at Storm's End and would have starved if not for the smuggler Davos Seaworth.

Stannis destroyed the Greyjoy fleet during their failed rebellion and was made Lord of Dragonstone and given a position on the small council as Master of Ships. He was later converted to worship the Lord of Light by the witch Melisandre who is called the Red Woman.