The personality disorder known most for having very odd beliefs with extremely unusual behaviors and perceptions is

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Schizotypal personality disorder is characterized by odd beliefs and behaviors, unusual perceptual experiences, and social and interpersonal deficits that can lead to social isolation. Delusional personality disorder is not recognized as a separate diagnosis in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). Schizoid personality disorder is characterized by detachment from social relationships and restricted emotional expression. "Odd/eccentric personality disorder" is not a recognized diagnosis in the DSM-5.

The Personality Disorder Known Most for Having Very Odd Beliefs