Aouron as I don't know Vincent.

Eiko as I don't know Barret.

Quina as I havn't seen Cid in action.

Yuna summoning anima would kill any of them.

Lulu one ultima blast from her would kill almost any of them.

Rinoa as I hvae not seen Aeris in action.

Wakka same reason as above.

Irvine his limit break shot could easily kill her.