I tried deleting the animation script, deleting the idle animations, and changing my character to a new type.
Picture of problem: https://i.gyazo.com/f8670658c9a5b4b43fd88d3d2f88bf84.png
If you just wanted to stop any sort of animations running in your character, the only thing you'd need to do is put an empty/disabled LocalScript named "Animate" in StarterCharacterScripts.
Though, if you wanted to replace the animations instead, you'd have to:
If you're letting the players pick what rig they're using, then I suggest creating a Server script to handle which Animate script you're going to insert in the player characters, while having an empty Animate script inside StarterCharacterScripts.
Hope that helps!