This Groensteen paragraph is perfect for Finder: Voice. You can find it in the coursepack on page 77 (essay page 127). Groensteen’s ruling out a definition of comics that depends on “the presence of a recurrent character,” and this is his fifth counter-example:
The character as a recognizable individual dissolves when all the characters resemble each other, ruining the very idea of identity. Within a population such as that of the Smurfs, the physical marks of individuation are extremely rare (initially reserved for Papa Smurf, Brainy Smurf, and, of course, Smurfette). Here, the process of naming (under a form of qualified epithet: Grouchy Smurf, Poet Smurf, Jokey Smurf, etc.) allows the story to adapt to the state that Bruno Lecigne has precisely baptized hyper-twinhood (hypergemellite). Certain stories by Francis Masse or by Florence Cestac have also come close to the total indifferentiation of the body.
(Above: image source. Below: my scan.)