Understanding that the piston is your primary tool for "interaction" is the first step toward unlocking content. Different characters will require different piston configurations, speeds, and specific items to be discovered.
Create a 3x3 spawning or bait area that is 2 blocks deep. lovely craft piston trap unlock all characters
Most characters in the game are obtained by gathering specific materials and using the crafting table Enderwoman Understanding that the piston is your primary tool