@FluxWaveZ: Sorry about the link thing. The reason I felt like posting this list is because it originally had Jill and Shuma as DLC and it was posted several weeks ago well before anybody else knew about those two.
Capcom has said no more shotos or Darkstalkers characters though so who knows if this list is right but getting the DLC is pretty convincing. No Mega Man seems odd though.
Marvel Galactus (Boss) Taskmaster (unlock) Shuma-Gorath (DLC) She-Hulk Deadpool Captain America X-23 Magneto Modok Hulk Spider-Man Dr. Doom Sentinel Storm Phoenix/Dark Phoenix Super Skrull Dormammu Wolverine Iron Man
Capcom Amaterasu Ryu Rad Spencer Chun Li C. Viper Hsien-ko Jill (DLC) Chris Wesker Dante Trish Arthur Felicia Morrigan Viewtiful Joe Tron Bonne Mike Haggar Akuma (unlock) Zero
Edgeworth and Phoenix Wright make cameos in She-Hulk's ending. I think I might be missing a character, but it's 38 for the roster. yes, if you have full 5 stock bar and Phoenix dies she comes back as dark Phoenix like gill resurrection. Also she has seth like health.
• Breath of Fire • Darkstalkers (no additional characters beyond Felicia and Morrigan) • Monster Hunter • Sengoku BASARA
It's not official that these characters/franchises won't be making an appearance, but it's very unlikely most of them will. • Akuma • Black Panther • Cyclops • Dan • Ken • Man Thing • PTX-40 • SonSon • Squirrel Girl • Wayne (Lost Planet) • More Devil May Cry cast members • Power Stone cast members • Rival Schools cast members • Three Wonders cast members