Super Mario, The Legend of Zelda, and Pokemon are Nintendo's big three, and three of my favorites. I don't mind how many characters those series get.
Otherwise, if you consider Star Fox with 4-5 characters total 'overrepped' than you can count it, too. Followed by maybe Metroid.
Question for you and anyone else. Mario and Pokemon are usually considered the top Nintendo IP (sometimes Zelda i guess but humor me for a minute). Below that (to varying degree's of popularity), you have Zelda, Metroid, DK and Kirby. Keep in mind that all 4 of these's IP's have not gotten newcomers since Brawl (While Mario and Pokemon still had more reps)
Metroid and DK just got 3 new reps, with potentially Dixie being added as an echo after K. Rool just like Dark Samus was added after Ridley. So a newcomer and an echo each possibly.
Do you think this will happen for Zelda and Kirby?
We know there are rumors that Skull Kid is in the game, and Bandana Dee is a highly requested character. Not only that, but Impa is an ideal echo for Sheik (with some changes) and its possible another Kirby Rep (Dark Meta Knight or something) can be made an echo.
I just think its time for these 2 to also get more reps just like Metroid and DK, especially since Zelda hasn't had a proper, unique newcomer since Melee (Toon link was originally a replacement for Young Link) and Kirby is missing its 4th main character.
Ridley was a massive fan favorite in general, with many Smash fans demanding that he make it. Ridley probably did have support despite being a stage hazard, due to how popular he is in general.
More people wanted Bomberman in Smash than Simon. It all changed when Bomberman was confirmed as an AT.
I thought it was mentioned that Sakurai and Konami couldn't come up with a proper moveset for Bomberman? Unless thats a complete rumor and I'm wrong.