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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.

"Where is it written that power is the sole province of the worst? That thrones are only made for the hated and the feared? You would be a wonderful king."

―Loras Tyrell to Renly Baratheon

Ser Loras Tyrell was a popular tourney knight and ranked as one of the most skilled knights in Westeros. He defeated the Mountain in a jousting duel to the surprise of many. His victory cost Littlefinger 100 gold dragons in a bet with Renly.  But he was latter bested in sparing match against Briene of Tarth.  He had an intimate relationship with Renly Baratheon and was the brother of Margaery Tyrell . After being incarcerated for months and confessing his guilt before the High Sparrow, he abdicated his titles and became known as Brother Loras. However, he died mere minutes later along with his father and sister when the Great Sept of Baelor was destroyed in a plot orchestrated by Cersei Lannister.

Renly : "Such a shame LittleFinger, it would have been so nice for you to have a friend."

Littlefinger : "And tell me Lord Renly, when will you be having your friend?" after Loras defeats the Mountain in a jousting tournament

"We've had vicious kings and we've had idiot kings, but I don't know if we've ever been cursed with a vicious idiot for a king."

―Tyrion Lannister to his nephew King Joffrey Baratheon

King Joffrey I Baratheon is a major character in the first, second, third, and fourth seasons. Though believed by most to be the eldest son of King Robert Baratheon and Queen Cersei Lannister, Joffrey is actually a bastard born from Cersei's incestuous relationship with her twin brother, Ser Jaime Lannister of the Kingsguard. He is the older brother of Myrcella Baratheon and Tommen Baratheon, both of whom share the same parentage with Cersei and Jaime Lannister.
He is the Grandson of Tywin Lannister and the Nephew of Tyrion Lanister.