Poor lesbians can´t catch a break on this site but the the real (and better) question returns.

At first i start as an assistant fresh from art school and go 100% Shounen when the first publisher bites. There i play ball for a bit and make my name with series that go a bit outside of the demographic the first chance i get (Death Note, Hadashi no Gen (read it!), Kenshin...) but the amount of burnout and failed careers is very high here.
Now i am a success and am in it to win it with a name and refined craft. Most importantly the children love me and will now follow me for the next 40 years. I may now suffer hardcore burned too so i half retire form drawing or rely heavy on assistants who draw "house style". Then i do seinen only (the reach of topics is insane here) with passion projects on my own schedule with a dash of gay/porn manga on the side do stay in the news and shock/prove that these can be good. Replace shonen with superhero and imagine that Alan Moore drew too and then i just described his career 100%. See my model works everywhere!
Addendum to my post on demographics last poll: The magazines also include out of demographic series in their publications so that readers don´t have to buy other magazines (at least from other publishers) if they want to read about topic X. Clever eh?
And now excuse me House of Cards await.

Shounen, i would show up to all those Shounen mangaka how to make a unpredictable story

Yuri, yaoi, and hentai are not a demographic... they're a genre.

Sorry but no jedinat MU should be correct here.

It´s from the the Yaoi wiki article and manga history books i have read stated the very same.
A seinen (and so on) manga can have strong yuri elements of course so then the homosexual tag is a genre. The same goes for hentai where yuri would be a sub-genre too. This is a very popular argument btw. and it will never die.

Edit: "Real" porn (of any kind) has always been a demographic (Lolicon/Shota are also seperata) of it´s own BUT Erotica (adult here) is not. Every book/comic/video store or librarian (cough cough) will agree as wiki does too.
Here yuri would be a genre like BDSM or Vanilla or...
Yaoi for gay men is Bara (there is also a lesbian version of which i do not know the name) and thus a separate thing too but not here and one could call it "specialty seinen" to some degree. Demographics aren´t technically target audiences in gender alone and cross demographical appeal is the most important thing in the world.
Google "the key demographic of 18-49" here. More women then men read Bleach for one but it is the opposite with My Little Pony so you paint a way too simple picture of the entertainment field as Berserk itself nearly started as shonen.
Were some of you surprised when i proved that recently?
For added fun: Comic Yuri Hime S is technically seinen while the main magazine Comic Yuri Hime is targeted at girls and Manga Erotic f is even demographic free.
The promotional magazine Newtype even run´s manga of their own so Five Star Monogatari is nothing really and 子供向け漫画 Kodomomuke manga are a separate thing too. Psycho-Pass the anime is josei (Noitamina), the manga are all shonen (JUMP SQ) but it all needs to be seinen if you ask me.
Let´s stop ok as i want to read what other people voted on and we have enough topics on the nonsense japan does with demographic. One of these should be pinned if you ask me.
Semantics War? LOL

Let's assume I could draw really well... And make my stories come to life...
I would definitely go for seinen (of the serious/gloomy kind), art-wise as well as ambiance-wise.


Surely you're aware that LGBTs are often a minority.
We never come on top in such polls.

If my amateur writing skills and horrible drawing skills could be ignored, I would draw a seinen manga. Action + adventure. Throw in a lot of dark themes and background. The cast doesn't follow the usual cliches, keeping the major characters unique and unpredictable. It will probably be a failure of a manga, but who cares ...

Honestly if I could become a mangaka with the talent and skills, I'd want to write something that would appeal to multiple demographics; something like Bokura no Kiseki despite it being published in a josei demographic magazine. Even though it is in a josei magazine, I think people would argue that it is not a story defined at all by its demographic. Also the fact that it is Josei and not shoujo gives much more artistic freedom I think since it can cross barriers that are constrained by a younger audience in shoujo. It doesn't necessarily have to be romance based either which is one constraint of shoujo. I'd probably dip into seinen a bit as well because the stories written for seinen have an appeal to me similar but not the same as josei. But since I'm choosing josei, I'll point out that it wouldn't be any of the nymphomaniac crap

Josei and Seinen. Too bad there isn't a multiple choice option...

Well, as a writer in general, I aim for the young adult demographic but with a strong periphery demographic (that's what I hope for, at least ><). So it's hard to say which manga demographic I'd write for, especially since they're gendered, and I don't write with any particular gender in mind. I voted shounen because it seems to have the most widespread appeal, though I'd be better suited aiming for the audience of a particular magazine, instead. The ones that most embody my style, I think, are Comic Zero-Sum and related, GFantasy and related, and maybe Comic (Blade) Avarus for something edgier, or LaLa (DX) or Hana to Yume for softer stories. And I'd avoid weekly Shounen mags like the plague.

I would definitely draw for seinen demographic. As someone who is more drawn to dark and gory manga, I would prefer to be the author of a seinen series.