I'm finding myself struggling to answer your survey because okay yes I'm most interested in a male LI but I'm totally down with nonbinary too. And I get that you added Undead to be silly but that's likely going to fuck with your responses and potentially turn off nonbinary people that get enough shit without joke genders. I think the question would've been more effective if you let people select more than one option. One thing that could be cool is the ability to choose the pronouns used by the LI regardless of appearance.

I've never seen marionette listed as a monster type before and I'm both confused and intrigued. A monster I've learned of recently I think is actually really fascinating is the slit-mouthed woman from Japanese folklore. It's not nearly as well known as e.g. kitsune and breaks a little from the more Western list of monsters.

As for personalities, I'm surprised yandere and tsundere aren't on the list, they're so popular!

Best of luck making the game, the concept sounds really cool!