If you pick up a Mog instead of talking to him, he will fly around in a circle and drop items or Magicites that disappear quickly. These are items or Magicites that you didn't pick up during game play. The Mog inventory holds up to 64 items, and the oldest item will be replaced as new items go in. The Mog inventory is also shared by the entire game (including Story and Multiplay mode) between all characters. Thus, if you have a high level character who does not pick up his or her drops, a low level character can use the Mog to get them.