Ask yourself, what does the interviewer really want to know?
- It probably won't matter than you have 2 siblings, grew up in a small town on the outskirts of XYZ city in ZYX country; it also won't matter than you went to a specific school or studied this or that topic. All this is largely irrelevant, and you got the interview anyway
- Instead, focus on how your background and expertise can help you become an outstanding consultant: How do you think, what can you do?
- The easiest / most traditional / perhaps a little boring way is to go in a straight timeline; more interesting & memorable is to craft a transversal story where you pull various parts of what makes you unique. I always remember that applicant who told us about counting toads in a pond as part of a volunteer project he took on while finishing his PhD. Just one story, very memorable, completely sealed the deal for me. I wanted him to join, right there and then!
PS: He joined our office, then left to Google and Uber - all largely on the strength of his story telling skills