After choosing your character on the character select screen, you can mess around with the characters, which most people know. You can select varying colors for each character and the like. However, there are two characters who have more important character selection options -- Princess Zelda and Pokémon Trainer. For these two characters, you can do more than just select colors. For Zelda, you can choose to start as Zelda or Shiek (simply press one or the other). For Pokémon Trainer, you can select which of his three Pokémon he'll start the battle with.