So, some Japanese guy on /r/nintendo on Reddit offered to answer questions about the Japanese point of view and market of the video game industry (Link: https://nm.reddit.com/r/nintendo/comments/3hmies/im_japanese_do_you_have_any_question_about/). I asked about Golden Sun and Isaac and the answer was not really surprising:
"I think it's kinda of between decent popularity between unpopular. But it's more decent popularity rather than very unpopular."
Someone also asked about Little Mac's bad reception in Japan, the answer:
"not upset. But it's not only little mac, the most of new smash characters were not desirable by Japanese except for third party characters which is mega man and Pac-man."
So I asked if they wanted more 3rd parties:
"It's up to Japanese fans. But I think many want to see third party very popular character rather than minor nintendo Characters. And nintendo already put all very popular nintendo character on Smash Bro long time ago. So, they want to see third very popular characters more."
"I think it's kinda of between decent popularity between unpopular. But it's more decent popularity rather than very unpopular."
Someone also asked about Little Mac's bad reception in Japan, the answer:
"not upset. But it's not only little mac, the most of new smash characters were not desirable by Japanese except for third party characters which is mega man and Pac-man."
So I asked if they wanted more 3rd parties:
"It's up to Japanese fans. But I think many want to see third party very popular character rather than minor nintendo Characters. And nintendo already put all very popular nintendo character on Smash Bro long time ago. So, they want to see third very popular characters more."