Qotho

Qotho is a recurring character in the first season. He is played by guest star Dar Salim and debuts in the series premiere. Qotho is a bloodrider to Khal Drogo. He is killed by Jorah Mormont after Drogo falls ill. Qotho tries to prevent Mirri Maz Duur from treating Drogo and Jorah intervenes.

Background
Qotho is a Dothraki bloodrider in the service of Khal Drogo. He is one of Drogo's closest allies and a stalwart warrior who favors the Arakh.

Season 1
Qotho accompanies Khal Drogo to view his bride, Daenerys Targaryen. Qotho is present for the wedding of Drogo and Daenerys and then rides East with them to Vaes Dothrak. When a drunken Viserys threatens Daenerys and her unborn child, Qotho breaks his arm and then restrains him whilst Drogo pours molten gold over his head, killing him.

Qotho is present when Drogo declares that he will lead the khalasar across the Narrow Sea and invade Westeros in vengeance for the attempted assassination of Daenerys. Qotho participates in the Khalasar's raid of a village in Lhazar, a peaceful country to the south-east of Vaes Dothrak. He objects to the Lhazareen godswife Mirri Maz Duur treating a small wound Drogo takes, calling her Maegi.

Drogo's wound festers and he becomes seriously ill. He falls from his horse in front of the Khalasar, a sign of great weakness. Daenerys calls for Duur, who says that only blood magic can save him. Duur claims that she needs to kill Drogo's horse. Qotho objects and a fight ensues; Qotho pushes Dany to the ground causing premature labor. Ser Jorah Mormont intervenes and kills Qotho.

In the books
In the A Song of Ice and Fire novels, Qotho is a skilled warrior, but he is also considered to be cruel and malicious, the least-likable of Drogo's three bloodriders.

In the books, Drogo's three bloodriders are Qotho, Cohollo, and Haggo. All three attempt to intervene when Mirri Maz Duur conducts her ritual to heal Drogo, and all three are killed in the resulting fight. Qotho was personally killed by Jorah, just as in the TV series. Cohollo and Haggo do not appear in the TV series, so all three have been functionally condensed into Qotho.