Sidekick Boy

Sidekick boy is the ubiquitous associate for almost any super hero. Possibly all of them. Nobody can really tell.

He would have a very flashy, if not actually flashing costume, so that any super villain about to land a killing blow on the hero, would be distracted just long enough for the hero to turn the tables on the crook.

As carrying notes around is an awkward task, especially when one is wearing spandex (notorious for lack of pockets), motivating phrases would be inscribed on the inseam of his cape. That way, when the obligatory moment arrives that the hero has doubts about his abilities, Sidekick Boy will be there with exactly the right generic but uplifting thing to say.

Naturally he would have to be of a religous persuasion. Partly as it would give him reason to fight the good fight without recognition or reward. But mostly so that he can constantly refer to objects as "holy".

The greatest thing about Sidekick Boy however, is that he is just generic enough that, should the worst happen and his mentor dies, he could resume working, only with a new super-hero (left hand man?).