The Harlettes -- Bette Midler's legendary trio of back-up singers, are always multi-cultural. In the early years, she would cast them to off-balance everything: she'd have a super tall white girl with huge hair (Ulla); full figured black woman (Charlotte) and teeny-tiny black girl (Sharon). The look of all 3 girls together played up to the campy tone of Bette's show. In the last decade or so, she's kept to a more balanced-out trio, no longer using that off-balancing (and overtly campy) 'look' for The Harlettes.
Yes, Charlotte Crossley, who played Motormouth Maybelle in the US Tour of HAIRSPRAY was indeed a long running Harlette, as was Linda Hart, Broadway's original Velma in HAIRSPRAY. Also of note -- Melissa Manchester was one of the ORIGINAL Harlettes back around 1971. Another well-known Harlette was Katey Sagal, aka Peg Bundy of FOX TV's MARRIED WITH CHILDREN fame, as was Mandy Gonzalez of the now-legendary Broadway flop DANCE WITH THE VAMPIRE.
Some photos of Linda Hart, Katey Sagal and Franny Eisenberg as Harlettes: