Simple question, out of all the people I the Anime who do to feel will come back for a few episodes? It doesn't even have to be main companions, just anyone. (I feel like main ones will be more likely though.)
For me, the main companions who are most likely to come back are: May (3rd gen remakes) Iris and or Cilian (recent companions) Brock (because he seems to show up every place that has a nurse joy within 100 miles)
I can't think of an no main people, but that's what you're for.
So there's my list. So who all do you think will show up.