I wanted to make a tutorial about character switching for quite a while.
When you press the change the character button, you must destroy the previous character sprite
you controlled and spawn another sprite in the same place where the character was destroyed called UnplayableCharacter0. That unplayable character0 sprite is a clone of the character sprite, with 2 exceptions:
1. It has no Scroll To behavior.
2. It is not controllable. Not necessary to delete the Platform behavior, however! Just turn off the default controls for the Unplayablecharacter0 sprite and let the gravity consume it (whatever).
Hope you understood. If you didn't, reply to me and tell me to send you a .capx where I did this thing.