A fictional character to be believable must have a credible back story and must behave in accordance with the established nature of real people in face of crisis and conflict as accurately depicted within a given framework of invention. If it's an historical character then to be credible they must act as history so indicated they did and/or as one can intelligently extrapolate they might have conceivably behaved, based upon a close analysis of their character amidst particular events given as many facts concerning such as one can possibly amass and inspect. The more one knows, the better one can intelligently speculate. |