I gathered this list since the Mii massacre that happened today but I had to change my speculation list slightly since I missed a few
Speculation Totem Pole:
Crash
Master Chief
Sora
DoomSlayer (???)
Chun-li
Waluigi/Zero/Isaac/Shadow (Assist Trophy upgrade basically)
Rayman (???)
Reimu
2B
Phoenix Wright
Spyro (???)
Amaterasu
Dixie Kong
Pokemon Rep
Sergeant Cortez
Rean (Trails of Cold Steel)
These are the names I expect to see during the final character speculation for the next few months. Personally, my totally out-there picks would be Kat from Gravity Rush, Estelle Bright, or Aloy from Horizon. All three have massive potential, they are low on the speculation totem pole, and they are pretty well-liked.
With that said, this list is always subject to change but this is what I expect from this thread and it sucks that these names, even though I love 2B/Phoenix Wright/Chun-li/Zero/Isaac and respect Sora/Master Chief, that we keep circling back to characters in this list.
We need to have more variety than this but it is, what it is. Hopefully, this ride ends soon so we can end the speculation machine for good.