Rikku = IEE
I agree with Yuna as EII. I think she's a consensus leader type. She's the kind of person who completely lacks any sort of self-direction, but when she gets a hint of where something might be she follows after it with all she has.
She's the kind of person who tries not to take sides in a dispute, unless she absolutely has to. She's also kind of... a "go with the flow" kind of person in that she won't put faith in anything that cannot be proven to be effective. A creature of her times, you might say.
These traits are very prevalent in FF-X and X-2. If not for Tidus she would have killed herself to defeat Sin. Although she herself didn't have the answers, she was clever enough to hang on to someone like Tidus, who apparently did.
Lulu is IEI.