I have seen a confidential list for another team which contains various info. Im not in a position to disclose who I am or how I saw this information, but I’m aware of how this community loves anything they can get. Additionally I do not know for sure when these characters/levels will be publicly announced, but from what I gather, a couple “echo fighters” are being hidden until release.
Characters:
-Geno
-Skull Kid
-Chibi Robo
-Shadow from Sonic
-Decidueye
-Dixie Kong
-Black Knight
-Karate Joe
-Medusa
-Dry Bowser
-Ken
-Isabelle
-Dr. Stewart
Stages:
-Lost Woods
-Booster Tower
-Norion
-Rainbow Road
-Entertainment System
-Sanderson Home
Characters:
-Geno
-Skull Kid
-Chibi Robo
-Shadow from Sonic
-Decidueye
-Dixie Kong
-Black Knight
-Karate Joe
-Medusa
-Dry Bowser
-Ken
-Isabelle
-Dr. Stewart
Stages:
-Lost Woods
-Booster Tower
-Norion
-Rainbow Road
-Entertainment System
-Sanderson Home