I am *guilty* of this -
A chameleon personality :: the person can adapt to his / her surroundings and "blend in" to make others more comfortable, its not necessarily a bad trait - but if used the improper way it can have a devistating effect.
An example including my own actions:
I can go to a "hick" party (country folk) and speak just like them and talk about cars, making myself not look like a "green thumb" (country folk talk for "noob")
A bad example with my friend:
He can go up and read someones personality by body language and then act a certain way to "use" them (if you don't catch my drift, he gets them to bed rather quickly)
There are several ups-and-downs about this characteristic but its merely something everyone does but they aren't aware of. No one wants to be seen as a negative so they change those traits into positives, this would be a clean example of how the chameleon personality applies to everyone in general ^_^ Keep in mind there are still stubborn people that won't change for anyone or anything.
Thanks for reading~