Comes from Sakurai's bi-weekly column in Famitsu, translated by Kotaku:
He also talk about making a character, and how it's far from being as easy as players sometime make it out to be:
Sakurai then ponder on how stuff can change over time, because just like the Mii which didn't make it in Brawl but made it in Smash 4, it's the same for Pac-Man:
Finally, Ridley is Smash 5 CONFIRMED:
"During development of Smash Bros. Brawl, Mr. Shigeru Miyamoto of Nintendo approached me and asked, 'Can't we have Pac-Man as a guest character?'" Sakurai recalled. "At the time, imagining the image of Pac-Man and his incomplete pizza shape, I thought to myself, 'Hmmm... That's a little too farfetched.'"
He also talk about making a character, and how it's far from being as easy as players sometime make it out to be:
While it's easy to imagine a character in a Smash Bros. game, on the dev side, there's a lot more to consider.
"How to give the character their own individuality as a fighter and how they'll move. Should the game system maintain a consistent form or not. What other fighters are there and how will the new character differ in strategy? Does the new idea fit with the original game? Most importantly, is it entertaining?"
Sakurai then ponder on how stuff can change over time, because just like the Mii which didn't make it in Brawl but made it in Smash 4, it's the same for Pac-Man:
"You never know what's going to happen in this world." Sakurai remarked. "I'll just keep my mouth shut. That's a good idea."