Mizuno, meanwhile, will play Mysaria, a woman who arrived in Westeros with nothing, but rose through the ranks to become the most trusted ally of Prince Daemon Targaryen, the heir to the throne. Ifans will play Otto Hightower, the loyal Hand of the King, while Best will be Princess Rhaenys Velaryon, a dragonrider and wife to Lord Corlys Velaryon. Toussaint will play Lord Corlys Velaryon, a powerful lord of House Velaryon (a Valyrian bloodline as old as House Targaryen) and the most notorious nautical adventurer in the history of Westeros with the world's largest navy. Steve Toussaint, Rhys Ifans, Eve Best, and Sonoya Mizuno also recently joined the project.