Quirky characters enliven ‘Happy Fella’
GLOUCESTER – Composer Frank Loesser was a hopeless romantic. Whether exploring the crowd of New York gangsters in “Guys and Dolls,’’ an ambitious young man’s rise to the top in “How to Succeed in Business Without Really Trying’’ or the story of May-December romance in “The Most Happy Fella,’’ Loesser always found joy in revealing the vulnerability just…