We need 5 Bob-Ombs at once coming from a Box.

This game lacks surprises.

Both have been in Smash since forever.
Speculating the Party Ball

Waiting for Motion-Sensor Bomb

How about the actual Dragon Balls? Seven of them would have to be collected to have any effect. But they would appear in three groups (like the Dragoon).
The first time would be the 1, 2 and 3 star balls, the next would be the 5, 6 and 7 star ones and finally the four star Dragon Ball. (The most notable one in the series)
Once they are all collected, Shenron appears and grants the collector a stock in stock mode (and prevents the player from losing a stock once if they have 99 stocks) and gives a point or does something else in time mode.

That said though, more anime items seem a little unlikely. The exploding tag was removed for other problems but it seemed a little too much anyway.

That's all that it does? For you to have to collect SEVEN items, you get afree life. whereas Special Flag requires you to stay immobile for 3 seconds. Dragoon gives a free OHKO, and Daybreak gives you a huge laser that's also a close range OHKO, for less than half the items.

Actually you'd collect the 3 at once in a small pile for the first 6 but for the 4 star you'd collect it solo and trigger Shenron.
And if it's too weak, you could have him subtract stocks/points from all your opponents and add them to you. (Unless it defeats the opponents. In which case it would just add the same number of stocks without subtraction)

Yeah. That seems cooler and more unique. I'd take that.

Speculating the Bunny Hood and Warp Star.

What does everyone think of having the Blast Mask from Majora's Mask? It could be a one time use item that detonates at the wearer's will, or detonates after a certain amount of time. The mask would cause some damage to the user but even more damage to enemies near the wearer of the mask.

It's possible that it could detonate several times but have a 15sec cooling time like in LoZ:MM even. The Blast Mask would be an interesting addition imo and there's several different ways it could be implemented.

I don't know if this is the right thread for AT characters, but I'm thinking of a Pterodactyl Assist Trophy from Joust. When someone picked up an Assist Trophy, the Pterodactyl makes the sound and swoops in to attack its opponents with massive damage.

That could be Ridley

Yeah, but Ridley is a villain from the Metroid Prime series, while the Pterodactyl is a villain from Joust, which basically appeared in at least one Nintendo console. In total, the Pterodactyl can swoop into the battlefield to massively attack its opponents in one hit, but doesn't breathe fire.

Speculating the superspicy curry

Sasuke in an assist trophy

We need the Hammer!