Ever since Kingdom Hearts 4's official reveal trailer confirmed the game's existence, fans have been revisiting this footage and speculating as to what the upcoming game will consist of. It's been made clear that a dramatic shift into the realistic style of Quadratum and the greater concept of Unreality is set to usher in a new era for the Square Enix crossover franchise, but the end of the trailer also implied that one core aspect of the numbered entries might be sticking around despite this. Kingdom Hearts 4 might keep the main supporting characters of the past to make for a cohesive transition moving forward, but there's room to build on the party structure as a whole.