Nope, from me. But Toise has a similar opinion on these characters, save Doc. I've always felt this way about the Mario series though.
As for Paper Mario, I think it's silly to add another MARIO, when you have two more recognizable characters and THE MARIO in the game already. Plus, we've seen how Links and Marios come out. Don't be fooled like we were when we thought Toon Link would be unique.
He also mentions fans like the third parties and they could bring new people to the Smash series, BUT, he notes some fans, and internal people from Ninty do not like the idea and are put off by them. He didn't try to say people hate Sonic or anything.
Jill's shown up on the Gamecube, Wii, and has two 3DS games coming out with her in them. (One she is one of the main characters) She's Nintendo enough, and more important than Leon. Despite his loverboy fanbase.