I guess begging worked well since Luffy got added and he's amazing, maybe main material. I never checked out One Piece never really knew anything but now I want to watch it at some point. Although his moveset is good enough that I think he may have been planned for inclusion.

's Final Smash: A voice shouting either "The World!!!" or "Za Warudo!" when he freezes the opponent.I'm not sure if it'd be funnier to have Dio's voice or just have Sandbag himself shout it.

's Final Smash: Hopefully he gets a Final Form like Gear 4th or something to showcase his maxed out abilities.

Final Form Mode: IMO in the earlier demos IIRC it was 0.8a and 0.8b they actually had the Final Forms balanced in a way that they'd work decently for a Final Form mode. When I got bored of playing the demo normally I'd allow CPU to transform into Final Form and try to defeat them while they're in Final Form, they actually worked pretty decently as boss fights if you damage them to 50-100 beforehand. All of them were beatable, even Yoshi in Super Dragon. I'd suggest allowing normal characters as well in this mode, the FF's would get a separate section on Character Select. You could have some fun battles this way especially if 8 player mode gets added too like 1 FF plus 3 regular on each team.

Character Expansions

New Characters:
Sephiroth, Cidolfas Orlandu aka T.G Cid, Squall Leonhart, Vegeta, Crono from Chrono Trigger, Magus from Chrono Trigger, Simon Belmont, Alucard, King K.Rool, Ridley, The Black Knight from Fire Emblem Path of Radiance/Radiant Dawn, Edward & Alphonse Elric(With a Team Attack/switch Down-B) from Fullmetal Alchemist, Roy Mustang from Fullmetal Alchemist, Jotaro from Jojjo's Bizarre Adventure, Dio Brando from Jojjo's Bizarre Adventure, Sasuke Uchiha, Kakashi Hatake, Saitama from One Punch Man, Genos from One Punch Man, Riku(Kingdom Hearts), Aqua(Kingdom Hearts), Axel(Kingdom Hearts), Master Xehanort (Kingdom Hearts), Mickey Mouse(Kingdom Hearts), Garchomp, Blaziken, Hydreigon, Aegislash, Gray Fox, Superman(Goku vs Superman), Batman, Iron Man, Captain America, Thor, Spiderman, Wolverine, Magneto, Night-crawler, Crash Bandicoot, Spyro the Dragon, Hit from Dragonball Super, Ridley, Pheonix Wright, Shadow the Hedgehog, Knuckles. I don't know much about One Piece but I might like to see a villain from them.


Returning characters:
Cloud Strife, Ryu, Solid Snake/or replace with Big Boss, Shulk, Ike, Roy, Charizard, Mewtwo(Although I'd like SSF2 to revamp his moveset), Bayonetta, Little Mac, Robin, Wolf, King Dedede, Ganondorf, Greninja, Diddy Kong, Lucario, Corrin(lower priority probably), Villager

Stages:
-End of Time(Chrono Trigger Stage): Morphing stage like Galaxy Tours, Epoch appears when stage transitions. Travels between Prehistory, Antiquity, Middle-Ages, 1000AD, 2300AD and End of Time. Enemies & bosses from each era can appear as stage hazards
-1999: Day of Lavos(Chrono Trigger Stage): Lavos changes form to each Chrono Trigger boss, uses their attacks as stage hazards
-Ruined Future: Dragonball Super stage, where the battle against Goku Black and Zamasu takes place in Future Trunks' timeline.
-State Alchemist's Exam(Fullmetal Alchemist Stage): a constantly morphing battlefield, alchemists like Mr Armstrong, Basque Grand, Scar, etc as Stage hazards

Kahn's Arena, Suzaku Castle, Midgar, Boxing Ring, Coliseum, Umbra Clock Tower. I'd like to see a One Piece stage and another Naruto & Bleach stage

Boss battles:
Random Final Form(SSJ Goku, Bankai Ichigo, Kyūbi Naruto, Super Sonic, Wario Man, Giga Bowser, Gear 2nd Luffy?): A random character is selected and you face them in permanent Final Form. Some adjusted stats to make it fair like a little bit less armor/knockback resistance making them more similar to Kyūbi Naruto or earlier demo Final Forms where you can combo them or even KO them. Bankai Ichigo maybe switched to HP. On Very Easy they're almost like a regular character in terms of reduced hitstun & knockback resistance. On Intense they're close to how they normally are when used as a Final Smash. For example fighting Giga Bowser would be similar to the battle against him in Melee although he'd be a faster/less laggy/etc version just like SSF2's Bowser.

Big Boss OR Liquid Snake
Metal Gear REX
Kurama the Nine-Tailed Demon Fox
Madara Uchiha(Base => Perfect Form Susano'o => Possessed Kurama with Perfect Form Susano'o Armor => Six-Paths Sage Mode)
First Hokage: Hashirama Senju(Base =>Sage Mode=> Wood Golem)
Fourth Hokage: Minato Namekaze
Part 3 Naruto
Frieza
Cell

Superman
Darkseid
Shao Khan
Goro
Motaro
M. Bison
Akuma
Ogre/True Ogre from Tekken
Azazel from Tekken
Nightmare with Night Terror as a 2nd stage(Soul Calibur)
Ragna from BlazBlue
Dracula from Castlevania
Joachim Armster from Castlevania
Mega Charizard-X or Mega Mewtwo-X
Lavos
Kefka
Other memorable boss battles from Final Fantasy like Phantom Train from FF6(you get Sabin as an ally)
Dio Brando
Galactus(MvC2/3)
Doomsday
Loki
Armored Batman
The Joker
Mike Tyson(Punch Out!)
Master Xehanort(Kingdom Hearts)
Hades (Kingdom Hearts)
Dr Wily
Dr. Eggman


Expansion Bosses: I'd see most of the expansion bosses if they are possible someday being superbosses
SSB Goku
Zamasu & Goku Black, Merged Zamasu 2nd stage
Gogeta/Vegito: Fusion of Goku & Vegeta
Baby Vegeta with Golden Great Ape form
God of Destruction Beerus
Broly, the Legendary Super Saiyan
The Ten-Tails
Aizen from Bleach
FF7 Party
Bahamut
Dark Khan(Fusion of Darkseid & Shao Khan)
Seth(SFIV)
Shin Akuma
Shin M. Bison
Unlimited Ragna