A "false persona" refers to a fictional or misleading identity that someone creates and portrays to others. It is a fake version of oneself that may be used to hide one's true intentions, gain trust, or deceive others. Full definition
Online dating scams are making scammers millionaires as they use online dating services to present false personas then get people to fall in love with those personas before asking for money. (onlinedatingsafetyawareness.com)
The anonymity of the internet lets people be anything they want and often it's a completely false persona. (netbest10.com)
That same year saw Day - Lewis taking on another character who assumes an outsized and false persona in James Ivory's «A Room with a View.» (rogerebert.com)