3DS Wild Mass Guesses Go Here
Pit used to be a full god, who was killed/injured by Medusa.Possibly a counterpart with Palutena. This is why he can't fly for long without help; his wings are actually crippled. The Non-Canon "Best Ending" in the first game was his true form.
Pit is the last of his kind.When Medusa's army invaded Skyworld in the first game, it's likely that all the angels that could went out to fight and defend their home. The monsters defeated/killed most of them. The rest were captured, but died in captivity in the Underworld. Pit survived captivity, and through a bit of magical aid from Palutena and leveling up, was able to return to Skyworld. We haven't seen any signs of other angels in recent media, implying that he might be the only one that made it out of the Medusa disaster alive. note
Of Myth And Monsters was not a sequel to the first game.It was a prequel. It wouldn't make sense for Pit to need training for the items he used to save Angel Land already, so it had to be a prequel. The reason the Armor wasn't counted as one of the three treasures in the first game is because it was never lost, Pit decided not to don it until he got the Wings Of Pegasus because it would be too heavy without them. The Mirror Shield is a part of the set he didn't use last time, so there were still three to get. Look at the Komaytos. In the first game, they look just like Metroids but don't act like them; in Of Myth And Monsters they look less like Metroids, only having one tooth and one internal nuclei. Now in Uprising, they are Metroids in everything but name; this is because over the three games they were adjusting to a new planet, and as they are the least developed in the Game Boy game it has to be the first chronologically. This is also why Medusa was able to conquer Angel Land. Palutena was still recovering from her encounter with evil king Orcos, and Pit fell into the underworld after the sun burnt his wings; he had in fact been there long before Medusa came out and her leading the underworld troops against overworld and skyworld is what let Pit escape, as they otherwise would be too busy guarding Pit, preventing him from getting a weapon. Uprising is the first true sequel and is going to show us that Medusa will not be able to get nearly as far when both Palutena and Pit are at full strength.
Pit's name is actually the shortened form of his given name.His given name is might be Pittacus.