They do and they have. They publish M rated games. Nintendo may not develop M rated games but they do publish them and have put characters from M rated games in smash. As a fighter or a spirit. Nintendo paid for the distribution of Wolfenstein The New Colossus. They publish Bayonetta. They made a deal with Blizzard on Diablo III. Skyrim and others for exclusive content.  Switch I believe has the most M rated games of any Nintendo console ever made.  Nintendo could publish a dozen M rated games in a year and people would still whine and complain they are not adult enough or some are too anime. It's like how Nintendo is always creating new IPs but they never count because they are anime or too niche or not gritty enough so usually the same people who call their games kiddie or need to make "adult" games. Which is such a broad brush. What constitutes an "adult" game. To me, people who say that are too insecure to be seen playing Mario by their bro friends.

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Smash characters don’t count, you know I mean full games in themselves. Those other titles are kinda old and again most 3rd party games skip Nintendo all together. Under most circumstances this would be unacceptable, which is why Nintendo is the go-to “second console” for millions. 

Id say an adult game constitutes complicated characters with a nuanced story with mature themes like violence, sexuality, and general dark/gritty atmosphere. It’s not wrong to say Nintendo doesn’t offer that with 1st party. They are great at what they do, but you (fans) shouldn’t sweep under the rug concerns that people want a little more then their usual whimsical family friendly couch gaming session games. 

This happens every gen. Never tell a Nintendo fan their console doesn’t have adult content. Because whatever games you list, they are table scraps compared to what PC/Ps/Xbox get year round. My point is I’m defending people that have a legitimate desire to see Nintendo diversify their offerings. 

I'm not a Nintendo fan. I get accused of being a Sony fan sometimes as well. I'm a games fan. Said it before and say it again. Look at my name. Leynos. As in Assault Suit Leynos from the SEGA Genesis game. My avatar. Zone of the Enders 2 on PS2. My fave systems are SEGA. After that I have MS systems and Sony systems and Nintendo systems and NEC systems and Neo Geo. I love video games is all, but there are some stigmas that need to die and people have a lost of false misconceptions about Nintendo. Smash does count as they are not just publishing M rated games but promoting them in their so-called family-friendly fighting game. But nothing ever counts for people who want to claim they never make new IPs or make "adult" games as the goalposts are always moved.

why include the joycons, it is 6.8" without them, iPhone Pro Max is 6.2"

still big I know, they could make it smaller if the technology is there

 Ill point out that most high profile adult themed Switch 3rd party content is just hand-me-downs from consoles that have the lions share of its sales. Majority don’t come at all. 

I have to ask, because I know Nintendo fans are passionate, but I want a plain answer: do you think Nintendo should diversify the themes of its games beyond family friendly and not rely on old 3rd party ports? Personally Nintendo was my only console growing up but as an adult I like those adult themed games and stories that Nintendo games just don’t fill. People are entitled to want their tastes accommodated, so shooing people away that want Nintendo to satisfy their growing tastes is sweeping the problem under the rug. You just driving the older generation away as Nintendo welcomes in the next batch of kids to replace them. 

On another note, do you feel Nintendo needs a complete overhaul in their online infrastructure? Not just modern multiplayer infrastructure but having a digital storefront for their legacy titles that is actively updated and not abandoned?

Thank you sales2099 you nailed it - exactly what I wanted to say. By the way, I'm a die-hard Nintendo-gamer, still owning all Nintendo consoles (home consoles and handhelds). Besides, I'm owning a PlayStation 2, 3 and 4 Pro (and never played on PC). Currently, I'm only playing Nintendo Switch, it simply consumes all of my gaming time. I absolutely love most Nintendo games but as pointed out by sales 2099, Nintendo first party doesn't cover enough adult themes. Ironically, I'm thinking of Sony exclusives such as Uncharted, The Last of Us, Heavy Rain, Beyond: Two Souls, Detroit: Become Human, God of War, Horizon Zero Dawn, Ghost of Tsushima, Halo from Microsoft, etc. Yes, Nintendo is doing a good job with their addictive games from keeping me away from other games that are thematically more my taste. That's funny, but we only have so much time to play;) But for many others, that's not the case and Nintendo is missing on potential sales!

Back in mid-90' to early 2000' I was also a big Manga/Anime admirer but after that almost only shit came out geared too much towards teenagers (for my taste anyway). That's why I also have a natural distaste for Anime-games, there are some great ones with adult themes, Xenoblade Chronicles for example, but some of the characters are just too cringeworthy for my taste which applies to almost all of the Anime-games.

Metroid is probably the most adult Nintendo in-house series. I have nothing to complain about it but I personally don't like if certain things are not explained and are just left in the dark. Metroid leaves too much unexplained for my taste. Of course, it's fun if you can discuss about what happens between the lines and certainly more entertaining than if everything is explained but for my taste just a bit too much is left in the dark.

Again, the above in bold from sales2099 says it all. To reverse the statement: There's no need for Nintendo to shy away adults that want to have adult-themed games. Third parties will always be there but third parties alone are not the solution. If there's much demand for certain themes, Nintendo should fill the gap!

As I said, its up to Nintendo's developers to be interested in developing the games you are talking about. Do Koizumi, Aonuma, Yabuki, Kyogoku, and the like appear interested in developing such games? I don't know.

Though, it is important that we keep Nintendo's philosophy in mind. Their first priority is fun gameplay. Everything else is secondary for the most part. I don't think they want to develop a dark game just because they want the game to be dark. They want the gameplay to have a purpose and to make sense with what the other content is being present. Take Splatoon, for example. They didn't create a new IP just for the sake of it. The environment and world of Splatoon made sense for the gameplay the developers were trying to implement, covering the surface with ink and moving around swiftly through said ink.