In general it's going to have most of what you can expect from other trainer type games. So vaginal, anal, Creampie, BDSM, a little voyeurism, some more male dominated scenes, a few female dominated and a focus on 'corruption' - even though everything will be consensual. Mira(blue hair) is planned to get her/his first anal scene next update.
And absolutely NO NTR, sharing or otherwise. There's potential for some Netori type stuff down the line but that wont be for a while.
As for characters, I currently have 8 total characters in mind for the game. I've already made the models for 3 of them, with 2 making their first appearance next update.
We'll see how it goes though, I'm not against adding other characters but I've had all of these in mind since the start of the game :)