The original (1991) is renowned for introducing several revolutionary features that became series staples, most notably the Active Time Battle (ATB) system. This mechanic moved away from traditional turn-based combat by introducing a real-time element where characters act once their specific gauge fills.
One of the few entries that allows up to five characters in the active battle party simultaneously. FINAL FANTASY 4
Depending on which version you are playing or developing for, different features define the experience: The original (1991) is renowned for introducing several