Cid (FFIV), Cid (FFVII), Cid (FFTA) and Cid the Frog (FFIX). Might be a bit difficult to organise in terms of who should be doing what, but I'm sure we'd manage!

In all seriousness, I think I'd like Beatrix, Freya, Rosa and Rydia. Rosa can deal with healing, as can Beatrix in a pinch. Freya, Rydia and Beatrix can all deal the damage and I think it'd be pretty well covered. No particular reason for an all-female squad, just worked out that way