According to this thread:
As to the OP, I’m pretty sure they said the 5th is likely to be a shapeshifter. Can’t quote where, but I believe it was heavily implied in an interview.
A few people have mentioned that the 5th monster will be a shape shifter.
Is this related to the ones taking over the government right now, or is it a pure piece of fiction that is just coincidental?
Examples of alleged reptilian shape-shifters taking over the world: