Earth! Fire! Wind! Water! Hear...er Gravity!

[blackmage_nuke]

I stuck Cloud with lightning but thats about it. I think might have given Barret Fire and Tifa Ice.

If I had to associate them with FF elements I'd go with the above plus Wind for Cid, Earth for RedXIII, Holy for Aeris, Dark/Gravity for Vincent and Nonmagic for Yuffie and Cait Sith.

If I had to associate them with CT elements, Lightning for Cid, Fire for RedXIII, Water for Aeris, Shadow for Cait Sith, Vincent and Yuffie. Tifa would probably match fire better but than water but I'd then be left with no water when a certain someone abandons the party