I made this just to showcase characters I would like to see in future Smash titles.
Not based on current speculation:
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You know I always come late to stuff right? Despite being a huge Adeleine supporter, I got Kirby Star Allies only a few weeks ago, and now, after having played as her, I need Adeleine in Smash even more.
All the characters added by the updates are cool, but Adeleine is special, I can't stop improving her Soul Melter EX record over and over (currently I did it in about 18 minutes and stuff, and there's still some room for improvements - obviously Adeleine solo/no cpu and without using Amiibos).
And well, I waited for a decent discount to get Kirby Star Allies, because people online said it was short, the helpers play for you, levels look generic, and stuff... but I enjoyed it a lot, it's way better than I thought, especially thanks to the content added by the updates (already spent more than 100 hours in it).
She would be the same type as Villager, a character about taking control of the stage and placing traps, but the concept would be pushed to extreme. Also another cool thing is that all the stuff she draws is a reference to some boss or enemy or character from the Kirby series, and that there's no limits in what she can draw (they can give her a completely different set of summons compared to Star Allies, because there's not a main canon one, aside of the recurring Kracko and Ice Dragon, she always drew different enemies in each game where she appeared, including Dark Matter once).
Placing enemies and traps on the stage feels like if you are designing a Kirby level while fighting, so she would not only represent the character herself, but also the environment in those games.
Ribbon can still add variety... in Star Allies they still didn't fully explore what Ribbon and the Crystal can do, and Smash can expand on this (in the cutscenes of Kirby 64 the crystal is shown shooting lasers, opening star portals and traveling in the space like a rocket, nothing of this has been used in Star Allies).