One more example is from 'Harry Potter'. Professor McGonagall played a mentoring role for Harry. She was strict but always had Harry's best interests at heart. She taught him magic skills and also guided him in the ways of Hogwarts and the wizarding world in general, helping him to become the hero who could face Voldemort.
In the 'Star Wars' series, Princess Leia mentored Luke Skywalker in a way. She was part of the Rebel Alliance and got Luke involved in the fight against the Empire. She also provided emotional support and her own brand of tough - love leadership that influenced Luke's growth as a hero.