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  ===House Arryn===
  * '''Robin Arryn''' (seasons 1, 4–6, 8) portrayed by Lino Facioli. Lino Facioli Robin Arryn, Lord of the Eyrie and Defender of the Vale, is the only child of Jon and Lysa Arryn and a sickly boy doted on by his mother. He is still breastfed despite being well into pre-adolescence, and is mentally and socially maladjusted. He enjoys seeing people executed by defenestration, whether they are guilty or not (of note, Robin seems to enjoy seeing ''anything'' fall through the moon door, since the first thing he does when Petyr Baelish brings him a toy is to gleefully throw it through the moon door). In Season 1, he is present at Tyrion Lannister's trial, but shows little to no interest in the details and continuously begs his mother to make the "little Lannister baby-man" fly, which would mean Tyrion being executed, although Tyrion is acquitted. In Season 4, he greets Petyr "Littlefinger" Baelish as "Uncle Petyr" and meets his cousin, Sansa Stark, for the first time. Lysa later mentions in conversation that Robin and Sansa are to be betrothed. However, tensions arise between them when Robin ruins Sansa's snow castle of Winterfell and Sansa slaps Robin in retaliation. After Lysa is killed, Petyr proposes that Robin be taken on several tours of the Vale so as to prepare him for ruling it one day as its new Lord, though Petyr implies that his intention is for Robin to be killed in the process. In season 5, Robin is being trained in the art of fighting, but lacks the skill and determination due to his upbringing. Petyr leaves him in the care of Yohn Royce. In season 6, Robin is informed of Sansa's escape from House Bolton, and through Petyr's manipulations, Robin gives the order for the Knights of the Vale to aid her and Jon Snow against Ramsay Bolton.
  * '''Yohn Royce''' (season 4–8) portrayed by Rupert Vansittart.Rupert Vansittart Yohn Royce, known as "Bronze Yohn", is the head of House Royce of Runestone, a powerful vassal house of House Arryn. Like Lady Waynwood, he suspects Petyr Baelish of having murdered Lysa Arryn, but her death is eventually ruled a suicide. In season 5, he takes Robin Arryn in as his ward. In the sixth season, he is summoned by Baelish to lead the Knights of the Vale to aid Sansa Stark and Jon Snow against the Boltons. In the aftermath, after voicing his disapproval of the wildlings, Yohn joins the Northern Lords in proclaiming Jon the new King in the North. When Baelish is accused by Sansa of Lysa's murder, Yohn supports Sansa's decision to try Baelish.
  * '''Anya Waynwood''' (season 4) portrayed by Paola Dionisotti. Lady Anya Waynwood is the head of House Waynwood, a powerful vassal house of House Arryn. She suspects Petyr Baelish of murdering Lysa Arryn, but the death is ruled a suicide.
  * '''Lysa Arryn''' (seasons 1, 4) portrayed by Kate Dickie. Kate Dickie Lysa Arryn (née Tully), currently Mistress of the Eyrie, is the widow of Lord Jon Arryn. Born to the Lord and Lady of the Riverlands, she is the younger sister of Catelyn Stark, Lady of Winterfell, and the older sister of Lord Edmure Tully, Lord of Riverrun. She has grown mentally unstable since the death of her husband, and is convinced that as long as she stays boarded up in the Eyrie she will be safe. Justice for her husband rarely crosses her mind, unless exacting it doesn't mean bestirring herself or her guards from her castle. She is also overly protective of her son, Robin Arryn, which has made him a weak and spoiled child. In season 1, Lysa sends Catelyn a letter suggesting that the Lannisters were responsible for the death of Jon Arryn, which prompts Catelyn to investigate. Tyrion Lannister is later taken before Lysa to face justice for attempting to murder Bran Stark. Though Tyrion is innocent, Lysa appears uninterested in the details and even accuses him of murdering Jon. Lysa loses when Tyrion demands a trial by combat and Tyrion's champion, Bronn, wins. She later receives word that Robb Stark is marching on King's Landing to rescue Ned Stark, who has been wrongfully imprisoned, but fails to tell Catelyn. Catelyn confronts her and pleads for help, but Lysa refuses to provide Catelyn with more men, since her only concern is Robin's safety. By season 3, the Vale has remained untouched by the war, and she is betrothed to Littlefinger, who travels to the Vale to marry her. In season 4, it is revealed that Lysa and Littlefinger have been having an affair for quite some time, and are the ones responsible for poisoning Jon Arryn and (though indirectly) Joffrey Baratheon. When Littlefinger returns from King's Landing with Sansa Stark, Lysa greets her niece warmly and insists on marrying Littlefinger that same day. Later, however, Lysa accuses Sansa of seducing Littlefinger, but when Sansa insists that she did not, Lysa immediately calms down and tells Sansa that she is to marry Robin. However, Lysa catches Petyr kissing Sansa and angrily confronts Sansa about it, threatening to push her through the moon door, but Petyr intervenes and pacifies Lysa, before telling her that the one woman he only truly ever loved was Catelyn, and pushing her through the moon door to her death. Her death is ruled a suicide thanks to lies by Petyr and Sansa.