You should be using all same element himes and weapons, that way all your himes get the weapon skills. There are only a few exceptions such as Sol and Amaterasu since their skills are just that good or unless you're forced to use a mix/max passive eidolon like Luxuria (which is a pretty bad eidolon in general).
Other eidolons you do get a small boost to your team using the same element too (IIRC, it's only a 10% boost) but you should prioritize using the eidolons by their activation effect instead of trying to use the same element eidolon as your team.





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