Answer
For a first cédula, an adult needs the documents DNIC requires based on their immigration grounds: ID, proof of status, and, where applicable, a civil registry record. The exact list depends on the stage of the case and should be checked before making an appointment.
The key requirement is not merely showing up with a passport, but having grounds for the card to be issued: a registered immigration procedure, a decision, or confirmation that the data have been transferred. If DNIC cannot see the record, check whether it has been transferred between authorities rather than opening a new case.
Before your visit, check the appointment, fee, payment method, and list of original documents. At the appointment, your details are verified and your biometrics are taken. After receiving the card, immediately check your full name, date of birth, number, expiry date, and that it matches your passport.