A lot of them would probably be licensing nightmares. Although, if that's true, then how did Sora get into Smash?
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Including them would open the floodgates in the speculation scene to such a wider variety of options that there are people out there who fear it has too much potential to make speculation more toxic. Or at the very least more overwhelming.
Even without that, non-video game characters being playable in Smash just doesn't feel right to some people.