Copper mobs series

I would like to be able to craft mobs that work as logical functions, for example:
-A robot that loves loops and repeats what you do
-A robot that pushes random buttons
-A robot that became a solid block / entity
-A robot that replaces blocks with others
-A robot that drags entities. etc

A whole family of robots that represent the logical language and that interact with each other and with the redstone in a fun way.
Its main material could be copper with small derivatives of other materials to give them personality