Mistwalker announced that it has teamed up with Square Enix to arrange a crossover event for Terra Battle and Mobius Final Fantasy. The initial announcement was made on the “Square Enix Presents” broadcast during Tokyo Game Show.
This upcoming event quest will be coming to both games in the future and will let you collect characters from the other game. So, yes, you’ll be able to play as Final Fantasy characters in Terra Battle. And in Mobius Final Fantasy, you’ll be able to collect Terra Battle characters as cards.
It’s worth noting that what connects both Terra Battle and the Final Fantasy series is that they were both created by Hironobu Sakaguchi.