Some spoilers ahead!
In the first FFT there's a small cameo with characters from FFVII and Cloud can join your party and in the remake War of the Lions, we get Balthier! In Tactics A2 Penelo and Vaan make an appearance.
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If they make another Tactics and you got to decide who from another Final Fantasy would cameo, who would it be? As a bonus: Which was your favourite cameo?