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only some villagers have likes and dislikes, they just seem to come with them and i dont think you can add, i've not found a way too anyway,
As for the breeding if you have seven villagers and haven't built the hut yet they will go indoors and no babys,(maximum population for that housing) and depending on fertility tech level not all kisses produce babys, sometimes it takes a few trys x


With some events,if you make a bad choice then it can sometimes have an effect on a villagers likes and dislikes.