There should be relationship styles or romance styles, which are tied to traits too so it aligns well, and this also has an impact of how well the zois get along and if they want a relationship with each other/develop feelings.
Examples:
Someone with a hot-headed personality might not be open for romantic stuff.
Or someone could be really clingy and cuddly in a relationship, while someone else does’t like physical closeness at all, so these zois will likely not get along in a relationship very well, and won’t evolve any feelings towards the other zoi (though for the spice, surprises can happen, if other traits match enough or they get along really well for any reason, they can still develop feelings for each other even if they have completely conflicting types)
additionally if things like this occur, a zoi can also find out new things about themself, someone who hates cuddling may start to love it with the right zoi