@typhlosion Dial H for Hero works kinda like this! Protag has a magic rotary phone dial that turns them into a random superhero for a limited amount of time and they have no control over who they get.
@witchfynder_finder come to think of it, didn't early episodes of Ben 10 also work this way? like, he didn't know how to control the omnitrix yet so the alien he got when he transformed was basically random