Something new that will both surprise me, entertain me and keep me hooked.
But honestly, if you're still doing this, follow your own instincts. If you aren't motivated, your game will be bad, no matter how much money it makes or how many fans it attracts. Don't let people brainwash your goals and make you stray away from a plan. Suggestions are good but "I want this because it's my fetish" is the best way to wreck a game if a developer listens to it and finds out that just doesn't work anymore. Now, if you have a very open mind and that helps you expand, it's a completely different story as long as it doesn't mess with your current roadmap.
If you want to make a game for a completely random user, then pick from one or several of many fetishes in there: 2D, females only, yuri, scat, saliva, spitting,
loli, farting, smell, foot fetish, femdom, humiliation, role reversal, petplay, bdsm, facesitting, coprophagia, necrophilia, torture, blood, amputation, size fetish, tickling, trampling, female footjob,
age difference, catfighting, ryona, snuff.
And obviously hand-holding but that's far too extreme for an eroge.
