How to make a player change into a custom character mid-game

I’m not sure if this is in the correct category because I have never used the dev forum before!

I am creating an SCP game and would like to make a character turn into a custom SCP with the click of an image button. Whats the best way of doing this?

Thank you for your time!

if you have a rigged SCP model all you would need to do is clone it into workspace and set the player’s character property to the model