Note: These articles are more for discussion purposes before E3. They'll be short, sweet, and to the point for a brief recap and looking into possible characters/stages for each series in Smash Bros. These also go by a "Don't expect too much" philosophy. Please remember to be civil in the comments discussion.
The Mii's as a universe have technically been around since Super Smash Bros. Brawl as online avatars, but really, it's Super Smash Bros. for 3DS and Wii U where they particularly got to shine, with three Mii Fighter types.
If the Miis return, the question is if they'll return with their existing movesets or different ones. It's hard to say given how little we know about Super Smash Bros. for Nintendo Switch right now, especially due to the added complication of the Switch not having Miis, but what we can say is this: Miis are widely known.
If there's a "New Character" it'll probably be in the form of new Mii Fighter types instead of a brand new character. The only other character I can really think of is Dark Emperor, and that was after a while of searching. It would be amusing, but highly unlikely.
Find Mii, Pilotwings, Tomodachi Life, and Wuhu Island seem the most likely to return. Of all of these stages, Wuhu Island and Tomodachi Life feel the most likely to return.
If we have a new Mii stage, it'll be based on the newer Mii games such as Miitopia; There haven't been too many new Mii-focused games (yet).
Author's Note: What are your thoughts on the Mii franchise? What Mii related content would you like to see in Smash for Switch? Let us know in the comments below!