I'm an alterego.
It is not a way to hide - ask and I'll introduce myself! -, but a way to perform in a more earnest and honest way.
Our self images are usually loaded with expectations for ourselves - reputation, paths, the performance of what other people expect, of what we expect of ourselves.
An alterego allows focus.
The same could be applied to the front façade? Sure.
But being a character of yourself, so out in the open and clear, could make one hide what matters.
Boreign is a way for me to show what matters. And sounds nice.