GeekGold Bonus for All Supporters: 131.69
48.7% of Goal | left
See the person next to you? Kill! Kill!!! KILLL!!!!
I'm your baby! Can you feel it?
The Doppelgänger only copies the value, not the character itself, so it would be discarded.
The Witches ability refers specifically to the Witch being immune, not to characters of a certain value.
Hope this helps.