I'd like to speculate a revamped Smash Ball so that we'd be able to have more than one Final Smash active. With Final Forms being part of the Final Smash selection, it would definitely be nice to have two Final Forms fighting each other. Of course this would require some nerfing in the Final Smashes themselves.

I don't really like this idea. For one thing, even if nerfed, the final forméd character would have an advantage over the untransformed characters at GETTING the second smash ball.

And it's not like we can solve it by just having them not be able to hit the Smash Ball. That would make it extremely disadvantageous to even HAVE a final form because the opponent won't want to fight final-form-on-final-form; they'll wait until the opponent's form runs out before activating theirs.

I have a cool idea for an assist trophy, but Bowser is already in the game sooo...

Remember Bowser's 1st special move from Bowser's Inside Story? (Mario and Luigi) Well, he should appear as an assist trophy where he puts fire on the goombas, and they jump to the top of the screen, only to fall from the top of the screen, and every time it hits, it deals... Lets say around 20%, and it has enough knockback to kill you at around 80%. The goombas should also fall pretty fast. Maybe around 16 goombas.

Did you seriously say Bowser should be an AT... when Kamek could pretty much do the exact same thing? You're sick man

I think Kamek is open to lots of other possibilities if made an AT.

Or maybe Bowser Jr, if he doesn't make the cut to the game. But either way, it's a terrible idea to have Bowser as an AT

Just randomly throwing out ideas here;

Frost Gem: Creates a temporary platform, akin to Kragg in Rivals of Aether.
Full Fire: Temporarily increases the hitbox size of a character, but not the hurtbox size, effectively giving any character who picks it up a long-range disjoint.
EX Core: A "partial Smash Ball"; collect enough, and your Final Smash will be active. Can appear simultaneously with a full Smash Ball, allowing two Final Smashes onscreen at once.*
Mod Soul: If collected by a human player, hands control to a CPU for a few seconds. If collected by a CPU, hands control to a higher-level CPU for a few seconds.
Javelin: Single-use projectile that flies in an arc. Always goes forward, but direction thrown changes angle of flight and range.

(*I'm aware of the contradiction with my earlier post, but it wouldn't be a common occurrence. Only possible, with about the same probability as a Daybreak/Dragoon being onscreen with a Smash Ball in the official games.)

I think the Master Ball should be resprited to an Ultra Ball, simply because An Ultra Ball can be shaken out of, while a Master Ball cannot. After all, it would only take two minutes to change it, and would be much more accurate to the actual games. Still, I get that the Master Ball is much more iconic, but it could be handled a bit better.

As far as Assist trophies go, I think these would be cool:

1. Kaneki Akira: Drives on his bike and laser beams people. See my Tetsuo character prediction here: viewtopic.php?f=96&t=39274&start=1905#p1451295

2. Crocodile One Piece: Starts a sand tornado or uses Desert Grande Espada.

3. Kakashi Naruto: Uses Kamui to teleport a opponent off stage. At least to where it's a bit hard to recover

4. Stitch Lilo & Stitch: Runs around stage and shoots alien blasters. I think this was actually planned

5. Spyro Spyro: Spyro comes in a bucks and opponent off stage.

I kinda want more "Pokeball" and "Assist Trophy" Kind of Items

few examples could be:

Friend Cards from Kingdom Hearts: Chain of Memories
Can summon some of Sora's Friends such as:
Donald: Casts Fire, Blizzard, Thunder, or Cure
Goofy: Swings his Shield to attack enemies
etc.

Eddie from the Mega Man Series
Can summon Robot Masters such as:
Elec Man: Same as his Assist Trophy in Sm4sh
Proto Man: Same as his Assist Trophy in SSF2 v0.9b
etc.

Friend Cards actually were planned at some point in the past, but it was decided they weren't needed because two assist trophy items is enough. So they were scrapped.

Well I guess that's true. Ugh...why did Sakurai make Smash Balls as a Final Smash activator in the first place?

So you can turn them off in the item screen?

...I guess.

So we can finally kick some balls without any serious damage to the male human's descendants?