Although I know the concept because I'm a history freak, in Spain we don't use it, so when I think about numbers it's a difficult number to come by. Also, I talked on another site about 75% redhead LIs in that story (justified inside the game), so it should be a multiple of 4.
But you know me. I now say 12, and it's possible a girl who isn't a LI originally shows up, I will fall in love with her, and add her to the game. But she should be a redhead, to keep (at least) that 75%
But I'm in a very early stage of development, only one LI and the MC have been (tentatively) designed and that's because I need them for a future My Dorm update. The development won't start until My Dorm is in the closing stages. Perhaps the last three updates of My Dorm are published at the same time as the first of the next project.