If you need a good backup / mentor character for a superhero game, you may find Guardian useful for such a role.
Hero Happy Hour Super Shot: Guardian is a 4-page PDF (3 pages if you remove the credits/OGL page) for Mutants and Mastermind (3rd edition) RPG written by Dan Taylor and published by Rhinotaur in partnership with GeekPunk. This may be the first part of a series.
Sea of Stars RPG Design Journal 