There are a few different studies that explore the question: What type of personality do people diagnosed with Parkinson's disease tend to have? The assumption is that identifying people with a "pre-Parkinson's personality" may help the medical community diagnose and treat those people earlier on.
Two researchers at the University of Cambridge created a list of the personality attributes, after pouring through studies of "pre-Parkinson's personalities." Their findings were published in our favorite source for distinguished Parkinson's disease information, the journal Movement Disorders. There were four good studies that concluded that people who are more likely to be "pre-Parkinson's" are " . . . more rigid, introverted, nervous, and cautious."
There are also some studies of lower quality that concluded that people on the path to developing Parkinson's disease may also be gloomy, worriers, rigid, unassuming, conventional, unsociable, taciturn, quiet, serious, self-controlled, and inhibited. The studies assert that the people avoid new experiences and the risk of harm; and, that they are reward-dependent, depressed, hypochondriac, and hysterical. One concluded that only female introverts were "pre-Parkinson's".
An individual's odds of developing Parkinson's disease are less than one percent. So, even if a person matches those characteristics, the odds of developing the disease are still small. This information is still premature.