Very noob question here but "% character attack" on eidolons ONLY works against the element that you're strong against Dark vs Light? %Character attack doesn't do anything vs the other elements I'm guessing?

So as a dark main you would ideally want "dark attack" instead of "character attack" for your eidolon if you'd like to do all content? Having trouble deciding which shop eidolon would be best for my dark team Amphisbaena, Dulluhan, or Jack-O-Lantern.