The Purple Mech guy was a boss from Subspace Emissary. He was like a giant ape, and he had a Subspace Bomb in his chest, if you beat him, he could just Suicide Pact you and suck you into a black hole.
It is actually funny though I really don't mind Piranha Plant because it does work as a joke character (And also just because I imagine basically a long tube with a mouth is so much easier to animate that it's on the level of some echoes) and I imagine the final smash being Petey Piranha was actually that they planned Petey as a boss and just shrugged and gave it to Piranha
That was ST Falcon, if it's who I think you're talking about. He's from Battle Clash a Super Scope game and the main mech you control and is piloted by Mike Anderson (so you never see it in game I think, IDK I could never get past a mobile fortress named Ivan). The game is mostly forgotten about due to it being a Super Scope game and being a kinda "generic mecha" game to most.
I really hope we get character interaction scenes. The three pillars of a story is plot, characters, lore. Plots are stupid in fanservice crossovers. Nobody cares about the lore of some separate crossover world. It's aaaaaall about the characters. Absolute way-too-much-work icing would be if Sakurai handled cutscenes being uploaded to YouTube by just going all-in and redoing every cutscene for every character who could trigger it, so there are loads of different playthroughs.I have to wounder how many cutscenes if any are we getting in adventure mode, is just the begging, boss intros, and end cutscene, or are we going to be getting more as you progress and get more characters. Or is it a case of where what Sakura says is literal and we "have to use are imaginations". Personally I wouldn't mind if it was "here's the beginning cutscene" and then "here's the end cutscene" as long as you also unlock little trailer like cutscenes of the characters you unlock interacting with each other along the way. I mean I imagine that there has to be some form of character interaction other wise why is both Inkling girl and Inkling boy being represented other than just padding, and if any one says gender equality then there better be female Robin as well.
That could be it too tbh
Naruto Ultimate Ninja Storm 4 prided itself on having over 100+ characters.
When Goku