In “Tiny Beautiful Things,” Iza Calzado is joined by three other cast members who portray a revolving door of letter writers, all seeking advice from Sugar. Although the characters maintain anonymity by using code names in their letters, their stories reflect the vast human experience–with all the highs and lows–that will strike a familiar chord with the audience. Rody Vera, Gabby Padilla, and Ketchup Eusebio are the letter writers.