Just for fun, I decided to make what I would consider a reasonable guess for what the next game's roster would look like in terms of unique newcomers. I do not plan of making a full roster, though I might do echoes as well at some point.
I think we will see more newcomers than Ultimate's base game (6-7 if you count plant due to it being a pre order bonus) but less than Smash 4's base game (15). This I feel will apply no matter what shape the next game takes. Hard reboot or Ultimate DX, I think at least one more newcomer than Ultimate's base game at worst is the floor, while Smash 4's higher unique newcomer number is the ceiling.
- Pauline
- Waluigi
- Demon King Ganondorf
- Bandana Dee
- Meowscarada
- Noah/Mio
- Octolings
- Officer Howard
- Ring Fit Trainee
- Toy Con Robot
- Ryu Hayabusa
- Crash Bandicoot
- Sans
Here's my personal gut guess. If you want me to explain any character choice in particular, feel free to ask. What is your personal guess?