How much of anyone’s personality can be defined by their likes/dislikes? What are the other things one should look at?

A great deal, but not the whole picture, and also it depends what do we classify as likes/dislikes. Do we count such things as disliking people with certain kinds of views, be it on politics, culture or economics? Or do we boil it down to dislikes on more trivial things, like food, art or choice of clothes?