Olaf, the lovable snowman from the Disney movie Frozen, is a fictional character. Fictional characters do not have real-world mental illnesses. The creators of Olaf designed him to be a cheerful, innocent, and slightly naive character.
While Olaf's personality might seem unusual to some, it's important to remember that he is a fictional character and his traits are intended to be humorous and endearing.
Attributing mental illness to fictional characters can be harmful and misrepresent mental health issues.