If you have schizophrenia what other disorders or personality disorders can you have it? What's the max a schizophrenic can have?

Many. Schizophrenia is a psychotic disorder that disturbs the normal thought processes. It is often misdiagnosed and can often be accompanied by other mental health disorders. If there is a question about diagnosis a fresh look by a psychologist or psychiatrist is in order.
Complicated answer. Schizophrenia commonly occur with other conditions including general health concerns such as high blood pressure and diabetes as well as psychiatric including substance use disorders. There is no maximum number of diagnosis.