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Phoenix is the defence and Edgeworth is the prosecution because yes
Dedede is the defendant. I dunno if he’d be accused of murder or something more minor like stealing. Either way he’s innocent tho
Kirby replaces Maya as Phoenix's assistant. His special ability is eating the evidence. Is that helpful? Not in the least.
Meta Knight works with Edgeworth as his assistant. Being a witness would probably make more sense but I’m biased and want those two to work together so… Ye. The Kirby universe is a lot less realistic than the AA universe, so maybe Meta Knight's there to help Edgeworth with the more magical aspects of the case and explain shit. He’s pretty neutral on the whole situation, cuz he doesn’t believe that Dedede would commit a crime like this but the evidence is pretty damning.
Bandee’s the main witness and he hates it. He REALLY doesn’t wanna testify against Dedede, but he doesn’t have much of a choice. He probably tries to help Phoenix and Kirby in any way possible during investigations to get Dedede declared innocent.
Magolor’s probably one of those troublesome witnesses that bring Edgeworth pain lmao
More under the cut
The crime would take place in Dedede's castle probably. Wherever it is it’s pretty dark out when the crime happens, so stuff like colour isn’t very visible. Still, Dedede's silhouette is pretty recognizable, and it’d be hard to mistake him for someone else.
There’s probably a photo of the crime, maybe from a security camera or something. That could be why Magolor gets called in as a witness actually. He had recently set up all those cameras around the castle, so he was asked to talk about them.
It’s probably initially thought that Dedede was possessed when he committed the crime, since he has a history of that happening. Maybe Maya's called in as an expert on ghosts. Spirit channelling isn’t the same thing as what Zero, Dark Matter, etc. does, but it’s the closest thing the Ace Attorney characters would be able to compare it to. Still, judging by past cases, Dedede would still be declared guilty even if he had been possessed.
Maybe sometime during one of the trials, Kirby decides to snack on a seemingly innocent piece of evidence and becomes Poison Kirby, revealing that poison was used in some way during the crime?
During… I guess the second trial, when all hope seems lost, Kirby copies Phoenix’s lawyer abilities and realizes that the Meta Knight at the Prosecutor’s bench is, in fact, Dark Meta Knight! Apparently, Dark Meta Knight had disguised himself as Meta Knight and switched places with him during a recess (or even before the trial started). The real Meta Knight was probably locked inside a closet or something
This opens up the possibility that someone from the Mirror World committed the crime. The Ace Attorney characters didn’t even know the Mirror World existed until this point, and the Kirby crew never considered the idea since they thought the portal was closed.
Shadow Dedede ends up being questioned and brought to court, and he is found out to be the real culprit of the case.