What proof are required for minor to applying for PAN Card? Is minor himself eligible to sign on the form or his guardian/parents will sign over it?

Minor’s Photo and Date of Birth proof is required if a minor is applying for PAN Card.

The application also require documents from parents/guardian as mentioned in the application form.

No, a Minor cannot sign on the PAN Card Application Form. Instead, either of the Parents or Guardian need to sign on minors behalf.