I'mma teach u how to make more characters!
First your gonna click the deck you wanna add a character then click "Add a card" then you will go into you deck and make a button which will lead you to the other character after that make the collision, then go to logic and make a trigger "when this is tapped" then make the response "teleport player to new card" and click your new card that you just made and that is it! I hope you understand me