Okay so first off, if supposedly The Scientist controls the rainbow friends, what if the robots were like servants to TS? It would make sense why TS kidnapped us since if his robots got destroyed he wouldn't get any work done. Anyway, heres some function ideas:
For blue, since the actual blue monster is kinda dumb what if the robot was dumb too? Blue would only chase you if you were in a box, and then he would kill you. This could prevent people box-camping while also not just putting a random barrier in the way like green and purple.
For green, I wanted to keep the aspect of how annoying he can be! When green makes contact with the player, that player will have their box temporarily removed from usage. If you wait a bit tho, it will come back.
Since orange is very greedy and always wants to be fed, when you dont feed the orange robot enough, they will come zooming by like the orange monster and steal whatever collectable items are in your inventory, like blocks and sugar packs. Alongside that tho, the food bowl drain will be drastically shorter and maybe alarms will go off if the bowl is just about to deplete entirely!
Those are my ideas for the three robots. If you have any ideas or constructive critism, leave them in the comments below!