Jason Troy was given an extra assignment by his mythology teacher, Mr. Abin (likely a nod to Abin Sur, the alien that bequeathed Green Lantern Hal Jordan his power ring) for playing video games in class, to make a hero based on the most humble of creatures.

Jason learned that the pendant could change him into his heroic alter-ego at will, so he continued his exploits as the Fly.

He learned that using the Fly powers for a prolonged period of time physically exhausted him, and that he had cravings for anything high in sugar, like jelly doughnuts and pineapple juice.

He fought flying thieves, mechanical spiders, and the occasional crime lord, and defeated them all.

He joined the Crusaders, and when they got lost in another dimension, he spent years there with his teammates and fell in love with the Jaguar.

Whether or not the amulet would work for other people is unknown, but it does not seem likely as the message left for him by his mysterious benefactor, Mr. Abin, said they had been searching for someone like him for some time.