Well, without more context, it's hard to say precisely. But generally, a 'true story' implies it's based on real events. 'Mad to be normal' might be about someone's journey from a state of being considered'mad' to achieving a sense of 'normalcy' in society, perhaps dealing with mental health issues and the struggle to fit in or be accepted.
Without having read the'mad to be normal true story', it's difficult to determine the main characters. However, it might feature a protagonist who is at the center of the story, trying to redefine what is considered'mad' and 'normal'. There could also be antagonists, maybe those who uphold the traditional view of normality and oppose the protagonist's quest for self - acceptance. And of course, there could be supporting characters like peers or mentors who influence the main character's path.
It's based on a combination of true events and fictional elements. The story explores common themes and emotions that many people can relate to, although it might not be a direct account of one specific true story.