A "stubborn royal character" can be described using synonyms such as "tenacious monarch demeanor," "resolute sovereign personality," or "unyielding regal nature." These phrases convey the image of a ruler who is firm in their convictions and unwilling to be persuaded or swayed by external pressures. Other possible synonyms include "steadfast royal temperament," "persistent crown disposition," or "inflexible imperial demeanor." All of these expressions highlight the idea of a powerful leader who is determined to maintain their authority and adhere to their principles, regardless of the challenges they face.