Up until this year Japanese 3rd Party support has been horrible,
I believe that just the Top 2 Nintendo games on the Switch have sold more than the entire combined library of all the Japanese publishers(which is around 9 million).
Things are changing as far as Japanese 3rd Party support as I've outlined in some of my prior posts. Momotaro Dentetsu could very well be the first million-selling Japanese 3rd Party game, and Konami themselves should enter the Top 3 of 3rd Party Publishers on the Switch by the end of the year. Bandai Namco and Square are going to be the only ones ahead of Konami.
Bandai Namco & Square have provided "ok-ish" support, but their biggest franchises are either not on the Switch or get to the Switch with 1-2 year delay.
Marvelous could really capitalize if Rune Factory manages to release this fall.
Sega does have one Atlus game coming out this year but their support has been horrible. Koei Tecmo actually has two games announced for the fall granted one is a year late port but Atelier seems to be tracking better in terms of pre-orders on the Switch. Not as bad as Capcom thought, but Capcom could skyrocket to first place if/when they release some type of Monster Hunter on the Switch.
The worst off are by far Level 5, who went from one of the Top 3 3rd Parties on the 3DS to probably fall out of the top 10 by the end of the year if they don't release something. That's mainly because they were a mess when choosing how to invest all the money they made from Yo-Kai by trying to expand into mobile or Playstation markets - both their investments didn't pan out and have made them a total trainwreck
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