Get character select in Endless Puyo Pop
Pick Endless Puyo Pop in the main menu, then move the cursor to the mode you want to play. Press [Up], [Down], [Select], [A]. You will hear a sound and the character select menu will pop up.
By default, you will be using the plain old drop set (like Arle's). To use the character's own drop set, hold [Select] as you confirm your choice.
Unlock Everything
At the "Gallery", highlight "View Cut scenes", hold [Select], and press [Up], [Down], [Left], [Right].