In another life, Manny worked as a stressed accountant - this all changed when he ingested the Little Book of Calm.
And by ingested, we mean swallowed.
His former persona was washed away, and he was reborn a messiah of inner peace. Now he's an easy-going and charming fellow, which comes in handy both for attracting customers and putting up with Bernard's unsociable - and often outright hostile - attitude.
Manny instantly befriends Fran and helps her in her mission to reform Bernard into an 'acceptable' human being.