The antonyms for the term "assumed character" could include expressions such as "true identity," "authentic self," or "genuine persona." These terms suggest a person who is honest and genuine in their behavior, without putting on any façade or pretense. Antonyms for "assumed character" may also include the idea of transparency, where an individual is open and truthful in their interactions with others. Conversely, the opposite term to "assumed character" would be someone who is acting, pretentious, or fraudulent in their behavior, thus creating a sense of dishonesty or lack of integrity. It is essential to be aware of these antonyms when dealing with people to avoid being misled by their behavior.