A self-assured leading man can be described in a variety of ways, depending on the context and the specific qualities being emphasized. Synonyms might include charismatic, confident, assertive, suave, debonair, smooth-talking, or cool-headed. Other qualities that could be associated with a self-assured leading man include bravery, intelligence, wit, charm, or physical prowess. Depending on the medium or genre in which the leading man appears, other synonyms might be more appropriate, such as rugged, hardboiled, suave, or debonair for a classic action hero, or witty, introspective, or vulnerable for a romantic or dramatic leading man. Ultimately, the specific word choice will depend on the character and context of the portrayal.