I think it is very difficult to see the 'true' personality of a cat in a shelter.

Our 4 shelter cats were all VERY friendly at the shelter but once they are home and settled, things sometimes changes.

Milly changed the most from being very timid and friendly to being very confident and aloof (Still likes affection on her terms).

In some ways the changes are good. Treacle spent the first two weeks being very needy and affectionate. Now he feels loved & secure, he is less clingy and behaves more like a happy cat which is much better for him. (And we still get plenty of cuddles)

Bear in mind as you try to introduce the new cat, it can take a while for cats to co-exist and even longer to become friends (Though there can be instant friendships if you are lucky)

The best advice I was given from this site. Let the cats deal with other, don't interfer with fights or hissing (unless blood is spilt) the quicker they decide who is boss the better for them.

All the best with finding your new cat and we want to see photos