Pac-man has little chance. Just because he's made by Namco means nothing. How about the fact that the Pac-man game for the Wii U got canceled? Or the simple fact that Pacman can't fight. I mean he's even been in a fighting game before...piloting a mech...I don't think that would work for Smash. Not gonna happen.
Krystal has the greatest chance of these five, followed by Lucina as an alt skin for Marth. Of course, Chrom has a much greater chance, but I'm assuming he's top 5. I mean for crying out loud he has his own stage already, he's 100% going to be in.