Up the Down StaircaseSteel MagnoliasOf Mice and MenThe Importance of Being EarnestI Never Saw Another Butterflyany of the versions of Anne Frank's diaryCharlotte's WebAlice in WonderlandThe DivinersAnne of Green GablesThe Good DoctorClue
How about The Diary of Anne Frank? Or some of the older comedies like You Can't Take it With You? Or The Man Who Came to Dinner?
Any adaptation of a classic novel or play usually has a number of characters. Dickens is a good choice for adaptations. As well as any adaptations of C. S. Lewis. You might also look at Christian writers who aren't preachy-Lucas Hnath who wrote The Christians comes to mind. I don't personally know that play. And check out which plays A.D. Players in Texas have produced.