What prefix would you add to the root word figure in order create a that means take away or undo original appearance of somebody something?

The prefix you would add to the root word "figure" to create a word meaning "take away or undo the original appearance of somebody or something" is "de-".

Here's why:

* de- is a prefix often used to indicate the opposite or removal of something.

* defigure would mean to "disfigure" or "distort" the original appearance of something.

Therefore, "defigure" is the correct word.