Woooo, Chrono Trigger, yeah Double and Triple Tech attacks, those would rule! Umm yeah, that\'s what the idea reminds me of. In Chrono Trigger characters could use their skills together to execute more powerful skills. Like two characters had a special slash attack that when both of them used it they would do a dual slash that did more damage then using the attack seperately on their own. Skills could combine to do physical attacks (like the double slash), magic attacks(freeze and burn, like IcyHot except painful), and phycial/magic(a lightning sword strike) attacks.
Of course since each player is controlled by a person here, you would have to time the attacks to do such things properly, and if you did it would do more damage than if you just hit an enemy then blasted them with a spell. Be a great way to promote teamwork in the game!