Daario Naharis

A sellsword captain leading the Second Sons, Daario turns on his own employers and offers his blade to Daenerys Targaryen instead, killing his co-captains as proof of loyalty. Cocky, flirtatious, and dangerous, he struts into her camp with a flower and a grin, treating war as a game he intends to win.

Michiel Huisman plays him as pure swagger, all lazy smiles and theatrical menace, which makes him fun in a show usually starved for fun. He's a mercenary romance plotted with a wink rather than solemnity, and Huisman sells the charm hard enough that you almost forget how little you actually know about the man underneath it.