Re: Dlc in hentai games, Yay or Nay
I don't think DLCs indicate that a game was released unfinished. What AzureZero said before that some people might not like the fetishes presented in these add-ons is a good reason why they should be downloadable and not packaged with the full game or made into a sequel. To use a mainstream example, do you want to see Ryu fighting in a clown outfit? No? Well don't buy that costume DLC. (Disclaimer: There may or may not be a DLC clown outfit for Ryu, I have no idea.)
DLCs with actual content instead of just cosmetics, however, is a bit of a murkier subject. Sure, you could program the content into the original game, but if it's a niche fetish that only a few people would want, how useful would that investment be? If it's a part of the game that a large number of people would avoid, does it make sense to spend the money on artwork for it? I can't answer those.
Now, a hentai game that I could see a DLC model working really well with (if it weren't a free game), is Slave Maker. You have the core game, with some base slaves. If it were a commercial model, the extra slaves could be purchasable. Minor slaves could be bundled in packs and sold as well. Added content like the added events could also be made into DLC. Not everyone, for example, would like the breast expansion event line. Also, keeping the initial file size down would make it faster to download and get to playing.
For a few obvious reasons, nobody has to worry about Slave Maker becoming a pay game, but I consider it a good example.
For a story-based game, like an RPG Maker game, DLC wouldn't work quite as well, I would think, but I'm not 100% sure. I'd suggest make the base game first without the planned DLCs in it, and see how well it sells. Have a poll or some way to gather player feedback and see if there's a market for DLCs or not and go from there.
To go off on a tangent, though, I wonder how well a micro-transaction based hentai game might work...
But I hope your game goes well however you decide to do it AzureZero. I wish I had the finances to support you. Stupid money...