‘Game of Thrones’ prequel ‘House of the Dragon’ has cast Paddy Considine as its first lead character. Considine will play King Viserys Targaryen, chosen by the lords of Westeros to succeed the Old King, Jaehaerys Targaryen, at the Great Council at Harrenhal. A warm, kind and decent man, Viserys only wishes to carry forward his grandfather’s legacy. But good men …