These are the starting point for my recommendation for PII data elements for CCC based on the NIST recommended PII data elements (Alex Jackl):
Class 1 Elements: Obfuscated in open reports - except for Date of Birth as noted
Full name (if not common)
Face (photograph)
Home address
Email address
National identification number/SSN Encrypted
Passport number
Vehicle registration plate number
Driver's license number
Fingerprints
Handwriting capture
Credit card numbers
Digital identity
Date of birth (if linked to any other Class 1 element, otherwise allowed)
Birthplace
Genetic information
Telephone number
Login name, screen name, nickname, or handle
Class 2 Elements: Allowed in open reports so long as not associated with any Class 1 Elements]
First or last name individually, if common
Country, state, postcode or city of residence
Age
Gender
Race (if not linked to class 1 data)
Name of the school they attend or workplace
Grades
Salary
Job position
Criminal record (if not linked to class 1 data)
Web cookie
Class 3: (CCC Elements not covered by NIST)
Sexual Orientation Obfuscated and encrypted