Brain disorders (neurodevelopmental, neurodegenerative, and affective disorders) can be investigated, treated, and prevented using person-centered methods. Because researchers have not reached a clear consensus on whether or not personality is stable or changeable, it has been difficult to outline how to use these methods in the care of people with brain disorders. Thus, the first part aims to identify the ways in which brain disorders and personality are linked. The second part explores different person-centered approaches that can be incorporated in a healthcare or education setting to help people with various brain disorders and to promote physical, mental and social health. The third part focuses on challenges and new venues.