Villager and Wii Fit Trainer? Smash has included goofy characters before, but this seems way goofier.
I think the big issue that people have with the WFT (and, personally, I have the same issue with the AC Villager) is that she's a nameless, faceless character that really has no business getting the same "all-star" treatment as the other big-name characters.
Granted, they already used Mr. Game & Watch (which is most likely just a name they made up for him to include him in Melee), so it's not exactly like nameless, faceless character is a new thing for Smash. But at the same time, Game & Watch at least had some history to him. Trainer (and Villager, tbh) don't exactly have the history to even attempt to justify their inclusion in spite of their faceless-ness.