User blog comment:WillTheArthurandBusterFan5050/Which "Real" Characters Do You Think Should Appear on Arthur?/@comment-5612418-20170322100323

"Weird Al" Yankovic should definitely make an appearance. In an episode where Carl is struggling to write an accordion song, Al appears and sings a motivational song.

I guess he could be a rabbit, but if he appears in his old-school appearance it might be better if he were a poodle as his hairstyle would fit (he would look more like Mincey Poodlemeyer than the Deegans or Portia)