Compare Alan Sugar with Richard Branson. How you should look for inspirational people beyiond the celebrity status. (RB arguably more successful in business, does a lot for charity without shouting about it, is dyslexic).
Tim whatsisname from Shelterbox. Helped millions retain their dignity and family life in natural disasters with one simple idea and self motivation.
I also think they could discover who is more inspirational in the case of a musician who writes, composes and sings (with clothes on) compared to one that doesn't do any of those!
Discussion that hitting headlines does not mean inspirational. Actually, in reality, quite the opposite. Haedlines are done for effect and to sell papers and make a profit - whoever sells will make the headlines. Often less clothes more relationships = more sales.
Can they think of anyone at school who is an inspiration? Good at sport. Very kind. Very clever. A particular teacher. The Head or a deputy.